diff --git a/res/21/input.txt b/res/21/input.txt
new file mode 100644
index 0000000..aae01fd
--- /dev/null
+++ b/res/21/input.txt
@@ -0,0 +1,2027 @@
+vbrb: chdt * bjwg
+fjbm: jwfq * rghb
+pqdf: sthb + lfsh
+mcpm: 13
+wgvm: 8
+ljtb: lhfz + swzh
+qbgq: wbtc * gvpc
+lmhg: bdms * mlnv
+nlfm: hfvj - snpz
+blfg: zsmt - qbvp
+vmdh: wttr + whjh
+dtnd: 3
+svmj: 2
+jctp: lbtn * qwsb
+gzwp: 12
+ngzm: 5
+bcsc: hrvn + jncv
+tdmr: 4
+lcls: rrbm * glgc
+hjzm: vdpq * scgm
+vwrp: 1
+wwtw: bjwc * sfvn
+lzzh: 5
+bjwc: qscl + qbbp
+rqfs: bqsl * dptf
+pmcg: spjd * frjb
+bmgr: 1
+qdpn: frpm * dlbd
+rhtp: 9
+qnhh: cwlj * rmsn
+qfwr: 2
+zscw: 3
+dwsr: dfmp - nvdj
+wpmz: wmzt + fgbg
+gglg: 5
+vdsh: nltw + whlp
+mdvl: 2
+qlrn: 4
+qgfr: rnsj / qncv
+twsd: zwzd * rqtc
+phwf: 9
+wbsd: bmvp + shwc
+hrvf: 3
+lrcz: 5
+zbnm: wtrw * hzcc
+qrjs: rjbz + tvzh
+mhmv: 5
+pjbd: 4
+hmtl: 3
+ghpf: rdgh * gfdr
+fjvq: rglj * rpsf
+jncv: hwrh * frqm
+qmwj: 4
+jlwr: 3
+bwjf: 2
+jbvp: 5
+dwsb: cbmq + frmc
+mhzp: 19
+ncsr: 3
+pbcg: bbmn * qrvw
+zpbj: rsrl + znqq
+qbvp: 3
+rjbz: dqcj * qqbd
+hslf: 3
+zjdf: ndjb * jqqh
+tvgm: lpwt * hhjr
+drjh: 2
+rqvn: jsjg + zvhj
+tfds: 3
+wtzb: prqq + ptrm
+cpqd: qlwc * hnsd
+jsgt: vnzw * bncf
+smbr: 6
+zqsc: hwgd * fzbq
+wwdv: 2
+crrg: mzwv - bdgc
+hrvn: tzgt * pswg
+mcdt: fmlp * zhpm
+bmrl: gwqj * pztj
+tgsc: nltt * mmbs
+mdjf: 4
+nwcb: 1
+qhzc: 3
+qgsn: 3
+fvsw: ndln + clbh
+pvwp: 3
+frsf: fslb - bnsh
+ftqs: 5
+mzjc: ndlv + dwsb
+hqhv: vdsh * pdnv
+rqjp: bhfs * qbjv
+mdpt: plgj + cjmw
+sgqb: 2
+vsgd: fhcm + nmnd
+jgsj: nfdt * lfjp
+jzrp: 2
+fmlp: 3
+gdhf: 5
+nwlt: qmqw * fdps
+wqjh: 2
+bcwb: dlrt + bhmj
+qblm: 3
+mbtq: 2
+wcgd: 17
+nwvl: 10
+pcdc: 2
+smrd: 4
+qvww: sgnf * hjrh
+qvhr: phjh * pjdp
+qrvw: cqsh + rhtg
+lqwj: 2
+snpz: fszc + fdhr
+hdrv: 2
+wmnp: 2
+fcgr: 2
+ljqd: 2
+ddsn: 5
+wlph: gsbv * scpf
+nfbj: rqfs * tdhp
+ztzh: mmrg * dmgg
+hltt: 2
+tztg: 4
+jvnc: 3
+htjt: jtfh / tztg
+vlzg: dqcg * cfdq
+zrsj: 3
+blrh: 5
+gsnm: dcgs * gjns
+fzzf: 9
+gfdr: wntj + cdpw
+tddv: rbpz * tclc
+gpnj: zfqd * gnwp
+prqq: jddp + qtdr
+rtdc: 7
+ftpp: 11
+bfgt: ptgv * dfdm
+rdgh: 2
+sbmf: 3
+mfpj: 2
+bmhj: mmnm * pphg
+mzmv: 4
+jrst: tjgd - mphq
+vbtl: cgtc * jnvg
+qrph: bdft * sttt
+chhc: 2
+clng: vlzg + nrgj
+gbst: jpbv * zrjs
+mwfs: dmsm * hpcm
+mglh: 2
+bplp: 2
+fdhr: 4
+fgdm: vlfd + qdcf
+cjht: qtzt + rvgq
+gpfn: mqvd / srpg
+qflz: wghm - mpqf
+nqdj: wsmm / wghp
+cslr: 2
+jhhw: tfqg / pmws
+gmrs: dgpn * tczr
+vzph: ftlc * smzf
+gfcl: hvjm * gzjb
+lghg: 3
+vjpt: 5
+ttjf: 3
+cfdq: qsdr + cwlr
+cnts: 19
+nlgl: 3
+rpsf: mtmg + bhld
+mznz: clqz * nhwz
+hvgl: qllb * qwrw
+smgz: 4
+dvbw: psfb + bdcr
+svzr: hnbd * gndz
+jrsd: gnsq + dmzs
+sdrp: qcmm + nlcz
+rjhc: fjdn + jdmz
+whjp: 4
+flhz: rgcf * jzrp
+rwzh: 5
+vfjj: 17
+gjtl: tzsr + tdtv
+qmbl: 3
+pwvj: pvwp * nbcd
+fngw: 11
+jqhc: 4
+lscz: 3
+fcsq: cvfs * rqqq
+nnjz: wnrn / blwc
+glfs: 5
+nvpw: nfjt * bsql
+jmfw: 5
+qrsw: gpfn + ghpf
+hzbg: 2
+wdfq: tqtd + pzjh
+cggn: 7
+fpdq: lsht + vmlb
+pwsd: 2
+rhlp: vvgm + ngzm
+pzjl: 7
+nbcd: 7
+bzch: 5
+cvbp: 7
+qgql: 5
+wwsq: dhzp / bhrr
+zwnq: 2
+jbwh: 11
+tdcp: 3
+zcfn: 10
+fwwz: 5
+grfb: lgvj * bclh
+dsqn: prdr - mzhs
+fpgn: lbfv + qhbr
+cwwt: 2
+lqmv: nsnt + vtps
+djjr: 3
+vvgm: 6
+jgzw: lcvv / djzm
+bznq: 9
+nlwj: 6
+nzvc: 7
+nrjd: 5
+mnff: 2
+nstp: 5
+sbcc: 9
+tnpf: nbdd * vbhz
+zwtt: 2
+jwmj: 11
+njsr: 20
+phjh: 5
+szrn: bgqj / mbtq
+ccvw: rthp * bnbv
+whjh: 3
+fzsw: bgct * vbrb
+lhfz: 3
+rsqz: mmtl + mhnl
+gphw: pbfr + lcrw
+qmqn: ggst / lfzg
+mmln: nqrc + sjhq
+frjb: ctff + cjzh
+sqbd: wbdl + cncc
+mjtn: hzwf + wrzp
+zwtw: 2
+rjrt: 2
+wrwb: 4
+gwrr: 8
+zwnj: zdsn * zvsw
+pmqq: 3
+jzlf: 7
+vvpn: fvsw + dzgp
+gbjm: jcnw / lzwb
+mwwv: 2
+ftsp: 4
+ftgc: 5
+hgsf: splb * cvpd
+cdjr: 4
+btrz: 3
+hnsd: rjqm + stmg
+lhsz: fsqj + mznz
+jpgr: thpr / ltln
+zqnr: 5
+qzsj: nlwj + mglq
+nsrt: bhqg * ldtb
+brnc: bspd * gnnd
+llcs: fbjj - ffrb
+pdpr: gzzw * rjhg
+lcnf: 5
+gndz: 15
+zmmn: jspj * bdhm
+plft: 3
+zjlw: qdjp * qnhm
+lhhv: rhzv * hmtp
+jhrj: 5
+fdzt: glfh + zcfn
+gmvj: frtc + gmnn
+wnqs: sqsf + gbdt
+qdnw: 14
+vbmj: nrmn * bgtp
+ptnw: 2
+zlhb: 5
+rsbn: 5
+qhbr: 20
+qnhm: 2
+gghs: lbjd + mrtm
+nblh: 5
+vmmr: 3
+qscg: wqjh * bcwb
+rlbs: vqwj * qnhp
+bncf: 4
+ttfm: 18
+tqbs: 2
+nlzh: wpmz + hwvj
+bvbm: 17
+lcvv: pqqr * szfn
+smnb: jmvt * vtsq
+mwqj: 3
+dwcs: 3
+nvrt: wbjs + zmgg
+dlbd: rjzn + tlpl
+dgvj: sqcf * dctd
+vplt: swcp * ssdb
+dbhd: pqcq * jbww
+hpfg: brwb * dtnd
+cbws: 3
+lsht: gnsp * dvrw
+lqdt: dsqn / cspc
+nqqh: gzcc - fzww
+tlwf: 2
+vpgs: 1
+tqjf: 4
+hwfn: gwwp + lvjt
+hszm: pqgm + bgfc
+hdcc: gghs + wpsm
+hwch: 5
+mlvt: 6
+nfjt: 3
+ccsf: 14
+nblb: 5
+gbtr: phtb * nqqf
+qscw: 2
+cszf: 6
+rvjb: 3
+smhp: 2
+btgr: rszj + pldr
+jrbm: trhv / wprj
+vdpq: 6
+cbvz: 3
+qfmp: 9
+qnmq: 4
+lvrf: ptsq + hvdh
+stlz: 7
+lptg: 2
+wrgg: 2
+nwwl: 7
+ccfq: lzsq - vbdm
+sspj: 11
+wzwg: 3
+frfb: 3
+pfpj: tddv + gvhp
+zzdg: 4
+dzjn: pnnb + ndbv
+ltpc: 5
+htwc: 2
+mpbf: 2
+ntvh: 5
+bwsg: 4
+zbps: 14
+nltt: hdrv + mzsv
+cnvw: 2
+fqmj: 2
+psfb: hzbg * mhsf
+wsmr: 2
+njvh: 11
+bpnp: tqbs * bwsg
+slfj: zcnl * fwwz
+blsh: 2
+dfdm: hvgl + hphc
+cncs: tfds + gvbd
+jzrs: hgsf + wgsd
+ndbv: mhsj * npjp
+tbzm: bnwt * fbgq
+wjzg: dqtw + fgsj
+bbmc: jmfw + bhtp
+drjd: qvzd * bfts
+bnqh: 4
+bfbp: 6
+frcr: cvbw + qqgf
+cfsc: drgr * mvsc
+mmcv: 2
+rlvj: dhdm + lhhv
+qvdf: 6
+vjfd: 2
+wlzb: pslg * qjwm
+ngpn: cbpz / fcgr
+lchm: 3
+ttjh: 3
+bjwg: mfcf + vvpn
+hhtw: htwc * hrsh
+rqdj: fmqd + mztg
+dnft: vqnj / fcnc
+dnsq: 2
+mlnv: 8
+bqdc: cvbp + ltzz
+pfww: sjww + fsnd
+vvhp: 19
+qjwm: 3
+zltt: 2
+srpg: 2
+cnrp: fwzr + qmhg
+thpr: ztls * ptmg
+qlwc: 2
+gmnn: wmmb * ntvz
+wghp: 2
+bnwt: 2
+mztg: smnb + jtdr
+ljzb: 11
+ttjw: clfn * mhjt
+psvd: zjdf + fhnr
+nmgh: 5
+gcnb: dsrj - hzdw
+rrgq: 5
+rjhg: hplr - zphz
+plgj: ttls * tdmd
+fbzt: hqwv + rllf
+wgtw: 2
+vnrn: srbg * sqbd
+hcnq: qvww * pdww
+tqdb: dcqq - nwcb
+znmv: 6
+bvvf: 2
+gchm: 14
+nsrp: fpdq * wrjb
+zfcb: wbpf + slfj
+cbnl: mddl + qfsd
+rlmf: 13
+nfsp: fgpn + tbbp
+fdgc: 11
+zwzd: gsvf + mnml
+jngd: dflt * zcgs
+tdch: 6
+qfrn: 3
+dwnc: jphm * htdw
+vlfd: vfzq * pvwd
+gfwh: 2
+fbdd: 19
+jfbz: 5
+gfwl: dtqd + lgrv
+cbcl: 2
+bcqp: qrtj + mtqj
+dmvb: wnth + wgtw
+bwsw: mmln * gmnp
+hhmc: lzqs - tmlw
+bnsm: 4
+rzvm: 7
+zctj: qgsn * qstr
+gdqd: clnq / vfwc
+hzdb: 5
+wbpf: bgzz + hjzm
+hrwf: 5
+ptsq: nbqf + mblc
+bwdz: 1
+cbhp: 5
+sgtr: bgpt + fgfh
+rgcf: cmzt - zwtv
+znls: crlb + rfqj
+djzm: 2
+rcdb: 1
+scpf: 11
+bdgc: 1
+jnct: 5
+hplr: hbmb / pqrw
+dprz: 11
+pnnz: 4
+brvt: svzr + qtbt
+gchp: 1
+pmnh: gscv * cmqc
+mlrh: fjct * zgrh
+qfnj: 13
+vfrz: 10
+qrmb: 3
+lcmn: mdzq * fpzc
+mprz: dtbr + rrgq
+fpqf: 2
+tbnm: 4
+dbgr: lcmn + dnjz
+wntj: dwcs * dnft
+rhgc: 2
+bzhw: sgll * nbgz
+dgpn: 4
+qjzh: mllc / wjdv
+vmmf: qmqn - qdpn
+bjzp: swvv - bmnl
+bqhr: psgm + jsdm
+tqqv: 2
+jcqs: jnps + rlbs
+jbww: 3
+hhwc: pbgp * rtnj
+dmsm: pqdf / pgpd
+gczb: gchw - bqnb
+hmww: 5
+dqnb: 18
+chgf: cpgb / cczr
+zmvl: 7
+rwbs: fcff + mjqv
+dprj: 3
+dsjw: 2
+qmpn: humn - twsd
+dhvg: 6
+fgmg: jbtg * qfwr
+chqt: mtss * gtnj
+clbh: lcnm * dbhd
+gdbh: 18
+sqcf: 2
+bbzc: 3
+dhdm: 1
+qwpv: htjt + qrph
+qbzs: thjq + mzbj
+nglc: srbp - tbzd
+brfg: 5
+mlst: lbsv * qjsc
+vqsq: 3
+cfmz: vmgd + lqmv
+plhz: sbjb + qvdf
+ddgf: 3
+bhjp: 2
+wlwg: 4
+hjrj: 4
+cbgr: zstg * ffjj
+rzrj: mcdt - fzzf
+trfc: 1
+nbcg: 2
+zrzq: wgvm * ttdj
+vslc: zbnd / zqfr
+fppw: bjrg * qrjs
+ghqj: mzjc + sjjh
+bjrg: dfcm / ftsp
+fpdn: 2
+fnll: cfsc - hpfg
+fcnc: 4
+hmtp: 3
+zsjj: 9
+cwlj: 3
+dtbr: bztm * qtlg
+vmrb: mmtb * cgwr
+lmmc: qmzf * hqlp
+drfp: 3
+nfdt: swnq + gmrn
+qzft: 17
+hfvj: vwzt * rswp
+rcsz: sphh * mglh
+bmnl: bsjp + mhgl
+qstr: 2
+rllf: htsm * wmwj
+hwvj: 6
+wvtb: lvqw + rbrt
+mllc: bcql - zwnj
+frpm: zbps + qpwd
+bhvq: 4
+mwmc: 2
+zwtv: 8
+rglj: 3
+bwhj: jvbr * dmwm
+gztn: 1
+nbdd: rnpz + zdvz
+pmws: 2
+jtnj: 3
+zgds: 10
+vbww: 2
+rmqg: fdjc * bwsw
+hfhj: mjsz + rhwv
+frnq: 9
+wmmb: 2
+tsvc: 9
+swvv: drjh * hsbq
+sthb: tzhb + trrt
+rhgr: 1
+mpfn: jpgr + czzc
+rtgs: 5
+gsbv: 5
+cgwr: 5
+lvmd: 3
+nfrw: cszf + vzht
+vtsq: hlhf / zjtg
+ngzw: 2
+mhmm: 9
+lhzt: 6
+lnnq: 8
+mjpv: pvds * wnvh
+hzwf: zmrl * wlwg
+pqwb: 4
+qrzf: wlzb + ccgs
+bcns: 1
+tbsw: vcnz + tvgm
+fhzl: pcmj * lghd
+vmbr: qmbt + vtwd
+gmrn: ttfm + lltd
+mdzq: 2
+qfll: 9
+jbtg: 13
+ccgs: 11
+mcnw: rpzm * tgsg
+rrwt: qzqs + qfmp
+stwh: 8
+zdqq: tglb * nscl
+tftw: gchm + qzft
+cjtm: 1
+fvdb: rqsp + jjnc
+bbbj: 4
+hsbq: lvvl - jflw
+zbdc: lnrw + zflr
+dnzl: 3
+gnjj: 2
+ffmh: 3
+hvhf: 2
+fmqd: 19
+jttj: jlwr * psgc
+bcwh: dcff + rqjp
+jlfc: bnfv - dbhw
+dzgp: 18
+fszb: 2
+rllv: zwbb * dbth
+prdr: vjnb + fdcc
+jrvp: mwzr + mhmm
+gtbc: dcrr * tmww
+nvvd: 4
+mbtd: 6
+ctff: 2
+ddwp: 3
+hnbd: 3
+mtms: qgmw + cjgj
+nnjb: 4
+bsvj: cnts - pwsd
+lfjp: 2
+hjjh: qscg / fdnm
+mtnb: zgzd * rwqm
+dlrt: qblm * jzlf
+vtps: mjnn + bzhw
+fldd: jqbv + rcql
+pfsh: vhcm * frfb
+lljh: 4
+wpsm: ctgv + lthh
+lqrz: blsh * qrmb
+blhf: djjr * bhwl
+glzq: 5
+nsnt: ggsf - mdpt
+ndjb: 8
+hjcq: tmng * nprw
+zflr: mjwn + rrdz
+jmtd: 3
+bhld: 13
+dsnm: 2
+hvdh: 3
+fcff: 8
+qdws: fgdm - fmlr
+nqrc: 5
+bcql: whcs / lqpp
+fvpn: tdcp + vrhl
+gnwd: 1
+hcfz: jnct * ntln
+jtdc: rncr + wgll
+fjbn: pwfg + vrfc
+scgm: 3
+tfqg: fznl * zczg
+dtnp: 13
+mlfw: lbrq * tvtf
+mtss: 4
+mjqv: 5
+zrjs: 4
+gzsm: hnwr * bpws
+whmv: psvd * qqrd
+tmhm: gtvn * cswd
+qpjt: chgf * cvmp
+qvqs: 4
+bjcf: 2
+wgsd: 8
+tdmd: 4
+dptf: 2
+pqpw: 3
+lhcv: ntdq + fbfm
+rjqn: 3
+vdtc: 3
+tzsr: svmj * qflz
+nmgf: 3
+jqbv: tlsb / sdgp
+pnnb: hdwd * wqvr
+frms: 2
+cdwd: 2
+jdpn: nmhr / snzf
+jphw: 2
+wgjw: 4
+cnsm: 4
+cgtc: 2
+cvbw: pcnd + vslc
+cjgj: djdz - szjs
+zqfr: 2
+mcfb: 13
+nbqf: gpnj - bvbm
+fgsj: nnjb * zjjw
+rqjh: rnbh * lstr
+slzr: qrsw + mwfs
+hwrh: 4
+fnrn: hjcq * wvsd
+thvj: bnsm + cwpb
+tmvt: 6
+jssj: cqfw * cdfs
+cmqc: 2
+zczg: sgdg + wnsr
+tdtz: 3
+nvtp: vbtl * zrqs
+vlww: 2
+wgll: 2
+twdw: lddq - tzqg
+dcmw: 2
+ztfs: pcgf + qpjj
+ztls: lsfn * jfnf
+htnc: cqld - vnms
+dqtw: rccb - fptp
+vbhz: zrhg * vmbr
+bdhm: 5
+gbwq: 2
+wvmt: rvjb * jrst
+dmdn: jlwf * tngp
+rfqj: vqsq * mwqj
+fznb: 3
+gqwg: 8
+jcsg: hrvf * cbws
+jdmz: wvtb * rzvm
+qmbt: 5
+fbrv: ztfs + crrg
+tvhf: chrm * clng
+wmhs: 3
+tvjr: nzqn * ppzv
+pdww: vzjg + djhf
+vdsq: 5
+ljnh: 4
+bztt: 1
+flrt: fslr * lcgf
+vhcm: cqrc * bdsb
+cmzt: rrch + cqbl
+jmvt: 2
+qsdr: llvs * gdqm
+pjdp: nrjd * pntq
+rqqq: 3
+vsnc: hqcb * jjhv
+mhjb: 2
+vhnm: 3
+sddr: hlbq * qvqd
+qvpp: phwf + fjdl
+sdgp: 5
+tssr: 5
+btmc: qpbn * zwrz
+fdjc: cqhs - gchp
+bvhl: mbgm * lvdm
+cjvf: 4
+wmfl: bzmm * dqcq
+mgqb: 5
+cpgb: rnnf * gtbc
+rwgh: gbld + bpcd
+qllb: jqsj * dpdw
+stht: 2
+spvw: sbmf * chgz
+fbfm: dvbw * zmvl
+cqld: rwtt * rfmr
+rrfr: 1
+htdw: hgmc / pzjl
+lvqw: 3
+tvms: jrbc * vqnp
+pppn: 3
+whzm: 2
+hwfz: zctj + vwrp
+nzqn: fcbr * wrwb
+jhrd: 2
+vjqg: 2
+gnnd: 2
+smcs: nhnm + hzdb
+pcgf: 10
+ngzt: vzcf * cnvw
+pvbp: rbhl * qsmf
+zftm: mlpj + jcsg
+vrjv: ccvq * rtmc
+pfhl: bsvj + rgjw
+plzw: 5
+nhpj: gsvq + dtnp
+rwff: 3
+tngp: 5
+qpvz: 1
+cbmq: vlfl * cbvz
+qncm: 5
+fcbz: trrr * cdnj
+blvm: wmpz + lvgp
+gdvv: cdjr * vnhg
+qqmp: dqlz + bqvw
+zdbr: vfrz + bznq
+jjnc: 4
+sjww: lddw * ddgf
+jjhv: hcdb / rbgd
+lwnt: 5
+sjvz: zfpq + stzq
+lsvn: jgzw * pjbr
+csfc: wmfl * dfbg
+jdpd: 16
+bbdr: 2
+fcbr: 4
+ptmg: ssnj * pmtp
+rfmr: 4
+szwb: 7
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+blbq: qnhh - czmg
+sjhq: mgqb + rwff
+cdsn: spwm * bsrh
+dzhl: qvqs + sbcc
+nvjr: fpgn * pzjb
+nthb: vshh * vdgh
+srbp: vbvw / wflp
+mzbj: bcsc * rpsh
+swnd: vcjn + sjmp
+cdsw: jqwv * dlnt
+sgll: rbfl * smdh
+dfmp: gvfh * qwhz
+gvmt: qbgq + bcdr
+pcnd: tpvp * gcnb
+wqvr: 19
+hjcn: 7
+pqsm: nnwl + ntmp
+dhmn: pjzg * bwjf
+jbmb: wfmt * ftdh
+mqnq: 7
+qrcp: fszb * tdmr
+gfbh: tlvn * zscz
+bdcr: 1
+bwbw: tdbg * pqpw
+ftbn: ljqd * stlz
+qjsc: 2
+ggjq: 3
+lbfv: jbvp + qlrn
+pjng: 13
+qfjs: ntlq + rqvn
+lfzg: 3
+wjdv: 9
+vfrl: 3
+jrwv: 7
+pqcq: 4
+tlsn: lcjj * tgqf
+djfs: fjbm + zqsc
+gbdt: dvsf * nzlr
+lnrw: sndj + mprz
+lgvj: nlfm + sbjd
+wtvg: 1
+ghgb: nnjz * pnnz
+zqpv: 3
+gsvf: 4
+mnml: jttj + qspv
+qcmm: jcjj * cnbj
+rcbp: 1
+splb: 13
+wvrv: 3
+hprc: jzvg * qvpp
+cbnb: rlvj + fcbz
+mtmg: njgr + hdff
+rctq: 4
+jcnw: jgbr * hltt
+rthp: shcf * djfs
+bnsh: hmtl * qmbl
+qgbn: vjfd * nfrw
+fltw: lmmc + mwzw
+jrrp: 3
+nrsc: 5
+phtb: 9
+dvmc: nmrt * cnzs
+bgtp: 5
+pwfg: 3
+pvnb: tmwt * ntvh
+rghb: hsmq + brlg
+jgbr: hcvs / gfwh
+drwr: hfhj + nwlt
+phbv: 12
+mwzr: 2
+dhcl: 2
+pdgc: ddfj + zrzq
+mjnn: nnhg + slzr
+vpmt: fjbn - mchc
+jqsj: 4
+fjdn: tfvq * wvrv
+vcqn: 16
+pplj: zwtt * zqfb
+jsfl: 2
+hqss: tvms - dlsv
+qqbc: 2
+hwqb: cjht * nbnh
+gchw: spwr * qpdf
+phtm: qtzw + fppw
+lzsq: bcqp - ldlt
+zwrj: 2
+hhqv: 3
+sggt: sbrq * pfpj
+qclz: fngw + gvjc
+zfzl: 16
+fwzr: rjmw + mdwm
+dswc: mmcv * tssr
+clfn: 5
+vqbv: 12
+lbsv: cvjg + tcfd
+bnbv: wdfq * gwpw
+bsql: 3
+dcpf: qcln * hhtw
+bmvp: fldt * ftbn
+zblh: 2
+fgbg: jgfz + bclr
+fffz: 5
+vpns: rpzn * jfnn
+hhhj: bszp * lghg
+btjh: 4
+fqhn: 3
+rvjh: jjmb + vpns
+fdcc: gfmq * drfp
+zjpd: sggl * gnvv
+djhf: tcpp + mlst
+mmcj: 3
+hlsp: hpvh + rzrp
+fmtq: gwbf + jnrm
+vqzl: zfzl + mqgn
+bhfs: btcb + mpbf
+tpvp: qjpv + zftt
+bgct: 2
+lvft: 2
+rnsj: pbcg + flqb
+jlwf: 5
+ldlt: frsf * spjv
+chcr: 7
+pfrj: bbmc * pmqq
+nprw: 2
+cpcv: 2
+lsls: 4
+ccvq: phqc * mhzp
+qpbr: 4
+gnsq: vjlf - nbrr
+lmmd: 4
+rnrs: 7
+fsdg: 7
+grts: nqqh / lmmd
+lzqd: rbzz + bmwp
+swzh: mlvt + nstp
+dvnb: 2
+lgwl: nlpr - fcrs
+pvpc: hvst * pnbp
+nmnd: 11
+vzvz: 3
+bmdv: 1
+cvjg: 16
+hqwv: lqdt - jdpn
+bcsp: 7
+jwfq: fsbj - lbtt
+dzgf: jngd + jcqs
+vnzw: 4
+dqcj: gbdw + fqhn
+rpsh: 7
+vvzf: pppn * bhdv
+gzjb: 3
+vdgh: jssj + wqfs
+dfcm: qpbr * hjcn
+sbrq: 2
+hnvd: 4
+gtvn: gmhb + wmhs
+sndj: zftm * ffmh
+rrbm: wsjr + fbrv
+lpqs: qmwj + sgtr
+lpwt: jsfl + zcwc
+dlsd: 7
+rjqm: 1
+gttd: dvmc + hprc
+dtqd: bfnw + qvpf
+bwbq: vqdb + thvj
+cvmp: bwhj + qjzh
+gtnj: 2
+bhrr: 2
+hzdw: 4
+ssrb: 5
+fcrs: 6
+dbhw: 10
+qcbf: mtnb + bfgt
+bcdr: pmcg + qzpz
+cdpw: 4
+fvfd: hwfz * lptg
+drgr: 4
+bdms: 11
+rslh: 2
+hdzc: 3
+tqtd: dcpf * lzhn
+zdlc: 7
+lddq: tbnm * qmvj
+wtrw: 2
+nsch: 13
+ttjn: 4
+wrzp: cnlm / fcwg
+fhbr: 8
+dlnt: 7
+zllc: nsrp + zgrv
+mmrg: 3
+qtzw: vbzd - qclz
+hdff: 4
+lqpp: 2
+qtlg: tlsn + ggjq
+hdqh: 2
+ffrb: 3
+rhtg: vqbv / cdtc
+wmpz: 1
+mrzt: 5
+lmhb: 19
+zgzd: wbsn + zlsd
+sncr: hwbc + rwzh
+hmmf: lcls + psrq
+qfsd: bddw / ncsw
+rlnr: bwbw * srtj
+bncj: 5
+zzqb: zhcb + mwgh
+whhl: hltf / dsvp
+pnbp: 3
+vrfc: wdnh * vhnm
+cjzh: 4
+zvhj: 2
+mttv: sjph * vcqn
+mhtc: bczb * vhtj
+lmtp: rjhc + wrtj
+qpdf: hdcc + mvpm
+qjmg: wnqs / sfcc
+vcnz: zfcb + zmrw
+nhnm: 1
+dbth: 2
+wghm: sczc * cjbv
+mjqq: jzjg * sgqb
+hsmq: stsm * rwgh
+nhwz: chhc * qqzp
+bpws: 3
+vdnb: bzch * nblb
+bmtv: ljtb / cslr
+brlg: mtms / dsnm
+zjmj: rcbw + bmtv
+ppfn: vtvf * cdsw
+bqnb: vdsf + jhhg
+qmjd: 3
+mbgm: 3
+vjps: cdbn * lqwj
+qqwp: pfwr + vsgd
+sbjb: 5
+zsph: nblf + rhlp
+drjf: 12
+dmwm: bcwh - rcjh
+mhnl: gzsm * rllv
+clnq: fznb * wtzb
+cdfs: 2
+dhzp: rttj - fqhj
+fhnr: nvpw * mcfb
+lfsh: 19
+jllj: gttd - mlrz
+snlq: glzq * lrjl
+wfmt: 13
+rnpz: fjzj - grfb
+qbbp: jvlb + wvmt
+wnsr: 3
+bmsr: jwmj + lnnq
+rszj: frnq * hjjh
+zmrl: drfh / whzm
+dvrw: 3
+hqcb: htnc / smgz
+dclw: 3
+bgmg: mdjf * fllq
+szfq: 2
+lsdb: 6
+djpf: 2
+rbpz: gdcc - dfvf
+lzgl: rpts * qtln
+pgpd: 2
+qwzr: 2
+gcpb: 7
+lbrq: fldv - crgg
+cwpb: 15
+gwwp: 4
+jlmn: qlcw * wqnm
+qctm: nzbn * bmhj
+vpmg: wcgd * dplj
+wwjd: 2
+rfdr: 5
+cbpz: gcpb * fpqf
+dvsf: 3
+mgpl: rfdr * mhtc
+fzbq: tvhf / ssrb
+pjgz: dgvj / nbcg
+htsm: 2
+pcmj: 4
+mmbs: 7
+vlcs: ntcq / nzzs
+bhwl: 3
+pqtn: zqpv * qzsn
+jtdr: pzrg + pvbp
+hbmb: jcgf + vpmg
+tmlw: jzmw / zlml
+pvwd: 3
+qvvf: 5
+trrt: 1
+rbzz: wzwg * ngzt
+frqm: 8
+qvpf: fmtq + ghqj
+cqrc: qvvf + lsdb
+bszp: gmvj * vlww
+njgr: 2
+rblw: 5
+qlfb: dzgf * vzvz
+smdh: 4
+sqds: 2
+hwql: ftgc * flnw
+pjsm: 11
+tjwh: gjcw * wlph
+jtmm: 1
+vdqb: 3
+sttt: fffz * wrgg
+znnm: 3
+mzsv: 12
+mmtb: lmhb + bztt
+nbnh: 9
+hwmt: tgsc + wnvg
+frlc: pgzz + qhjg
+nnhg: rsbn * lzgl
+dgdw: gcph * mtpw
+qspv: 6
+tgsg: 12
+gnvv: 11
+zcnl: 7
+qtln: 2
+cqbl: gbjm * zwtw
+cbst: 6
+zqqt: gdzr + jhsh
+nzlr: 5
+tlqc: gjtl * zjmj
+rdhn: nglc * vhnl
+qcqq: 2
+nrmn: 3
+qlrr: 5
+rjmw: 1
+bfnw: gqwg + hmfc
+jfnn: 4
+qmzf: 2
+dqjd: 2
+ffld: whhl * bbmr
+nzbt: 5
+lzqs: cfmz * hqpl
+mmtl: 2
+ffjj: 3
+rblh: znzc + nvtp
+mzwv: qpvz + mqnq
+nglp: qtfz + ppfn
+qjpv: 5
+phwr: 3
+rlzg: 5
+cspc: jqsb + fllp
+mcnt: 2
+qsmf: 2
+rswp: jwqm * rhnb
+pbgp: 3
+cqfw: vprt + djpg
+qmnq: 2
+qmcg: 5
+zqfh: mwbc - vdtc
+czzc: qpjt + lqzh
+srtj: 6
+bpjn: 2
+jzgf: 3
+qmhg: 4
+mjsz: bjsp * lvrb
+qzpz: nvjr + dprz
+rhnb: 3
+tmww: 3
+vtwd: wsmr * jtnj
+gmdn: 2
+jwcr: 2
+zbgj: 3
+fjzj: vtwn * rjnp
+pwqb: drwr + qbzs
+rncr: 9
+wbjs: hjcg * rwbs
+jfqn: 3
+lltd: dnsq * gplz
+gtfw: 4
+pzjb: 2
+tzhb: dnzl + jvzb
+mpbg: 2
+bjsp: 3
+cllf: 2
+zmgg: vngp - jsgt
+mmrt: 11
+pjgc: vsnc * hccw
+pjbc: 5
+vqwj: lrcd - vtpg
+bplz: 3
+gzcz: 5
+bsjp: rtgs * szrn
+vfct: cbgr + qclq
+bgzz: 1
+jvlb: fltw * zdqq
+hnrs: nvvd * hgdc
+pwjz: 4
+vshh: 4
+qwhz: 3
+ttdj: 2
+dcqq: vdlm + mbhh
+rnwc: nmmf + snlt
+zlsd: tssm * vnhf
+lqzh: qlfb + ftzb
+vngp: lpqs - mhjb
+ptrm: qrcp + fnzs
+jqwv: 2
+pdpw: lmtp - hflp
+bqnh: 3
+lvjt: 3
+flms: rfzh * zrsj
+hcdb: wtlf * tmvw
+pztj: 2
+wlbf: fdwd * ngpn
+rrch: nmgf * ddwp
+hchc: 3
+sddn: 4
+ltzz: bshj * lffp
+psgm: 9
+sldv: 2
+bspd: fprq + tbzm
+fpdd: 4
+bcnh: jsqz * mgpl
+bddw: fqmb * fhbr
+dwgc: dbmn * vmmc
+jqqh: 9
+pztf: 3
+rqsp: tdjn * gphw
+sgcs: 3
+glfh: 3
+rmsl: csfc + zpbj
+znqq: nswh - pjsm
+wtjj: tvdd + whjp
+rhzv: 2
+lcwv: 3
+mtrg: 8
+nzzs: pqwb + wwjd
+prrt: csfd / cdwd
+hmzz: 2
+vbdm: fjtt + szwq
+lcrw: frlc - hfvh
+rbsb: fsdg * hzft
diff --git a/res/21/test-input.txt b/res/21/test-input.txt
new file mode 100644
index 0000000..7993b87
--- /dev/null
+++ b/res/21/test-input.txt
@@ -0,0 +1,15 @@
+root: pppw + sjmn
+dbpl: 5
+cczh: sllz + lgvd
+zczc: 2
+ptdq: humn - dvpt
+dvpt: 3
+lfqf: 4
+humn: 5
+ljgn: 2
+sjmn: drzm * dbpl
+sllz: 4
+pppw: cczh / lfqf
+lgvd: ljgn * ptdq
+drzm: hmdt - zczc
+hmdt: 32
\ No newline at end of file
diff --git a/src/days/d21.rs b/src/days/d21.rs
new file mode 100644
index 0000000..bb40b7e
--- /dev/null
+++ b/src/days/d21.rs
@@ -0,0 +1,119 @@
+use std::{collections::HashMap, fs};
+
+const ROOT: &str = "root";
+
+pub fn solve() {
+    let path = "res/21/input.txt";
+
+    let contents = fs::read_to_string(path).expect("I/O error, wrong path?");
+
+    // Holds the things the monkeys yell
+    let mut monkeys: HashMap<String, Yell> = contents
+        .lines()
+        .filter(|line| *line != "")
+        .map(|line| {
+            let split: Vec<&str> = line.split_whitespace().collect();
+            match split.len() {
+                4 => {
+                    let op = match split[2] {
+                        "+" => Operation::Add,
+                        "-" => Operation::Substract,
+                        "*" => Operation::Multiply,
+                        "/" => Operation::Divide,
+                        _ => std::unreachable!(),
+                    };
+                    (
+                        split[0].replace(":", ""),
+                        Yell::Calculation(
+                            Monkey::Name(String::from(split[1])),
+                            op,
+                            Monkey::Name(String::from(split[3])),
+                        ),
+                    )
+                }
+                2 => (
+                    split[0].replace(":", ""),
+                    Yell::Number(split[1].parse::<u64>().unwrap()),
+                ),
+                _ => std::unreachable!(),
+            }
+        })
+        .collect();
+
+    // Holds all known results of monkey yells
+    let mut monkey_nums: HashMap<String, u64> = monkeys
+        .iter()
+        .filter(|(_, v)| match v {
+            Yell::Number(_) => true,
+            _ => false,
+        })
+        .map(|(k, v)| {
+            (
+                k.clone(),
+                match v {
+                    Yell::Number(n) => *n,
+                    _ => 0,
+                },
+            )
+        })
+        .collect();
+
+    // go through monkeys and calculate monkey results and replace monkey references with monkey results until root has a result
+    loop {
+        // break out of loop if finished
+        if let Yell::Number(_) = monkeys.get(ROOT).unwrap() {
+            break;
+        }
+
+        for (monkey, yell) in monkeys.iter_mut() {
+            if let Yell::Calculation(m1, op, m2) = yell {
+                // if possible, replace monkey names in yell with their actual numbers
+                if let Monkey::Name(name) = m1 {
+                    if let Some(num) = monkey_nums.get(name) {
+                        *m1 = Monkey::Result(*num)
+                    }
+                }
+                if let Monkey::Name(name) = m2 {
+                    if let Some(num) = monkey_nums.get(name) {
+                        *m2 = Monkey::Result(*num)
+                    }
+                }
+                // if both numbers of calc are known, calculate the result and update both hashmaps
+                if let Monkey::Result(r1) = m1 {
+                    if let Monkey::Result(r2) = m2 {
+                        let num: u64 = match op {
+                            Operation::Add => *r1 + *r2,
+                            Operation::Substract => *r1 - *r2,
+                            Operation::Multiply => *r1 * *r2,
+                            Operation::Divide => *r1 / *r2,
+                        };
+                        *yell = Yell::Number(num);
+                        monkey_nums.insert(monkey.clone(), num);
+                    }
+                }
+            }
+        }
+    }
+    let res = monkey_nums.get(ROOT).unwrap();
+    println!("Result 1: {res}")
+}
+
+#[derive(Debug, Clone)]
+enum Operation {
+    Add,
+    Substract,
+    Multiply,
+    Divide,
+}
+
+#[derive(Debug, Clone)]
+enum Yell {
+    Number(u64),
+    Calculation(Monkey, Operation, Monkey),
+}
+
+#[derive(Debug, Clone)]
+enum Monkey {
+    Result(u64),
+    Name(String),
+}
diff --git a/src/main.rs b/src/main.rs
index 3f6cf55..b8067c8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,7 @@
 pub mod days;
 
 fn main() {
-    days::d20::solve()
+    days::d21::solve()
     //_all_days()
 }