diff --git a/res/03/input b/res/03/input
new file mode 100644
index 0000000..49321d0
--- /dev/null
+++ b/res/03/input
@@ -0,0 +1,140 @@
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diff --git a/src/days/d02.rs b/src/days/d02.rs
index 5618e8b..9641cfd 100644
--- a/src/days/d02.rs
+++ b/src/days/d02.rs
@@ -58,4 +58,4 @@ pub fn solve() {
         .sum();
 
     println!("Result 2: {}", result);
-}
\ No newline at end of file
+}
diff --git a/src/days/d03.rs b/src/days/d03.rs
new file mode 100644
index 0000000..1e6fa64
--- /dev/null
+++ b/src/days/d03.rs
@@ -0,0 +1,80 @@
+use regex::Regex;
+use std::collections::HashMap;
+use std::fs;
+
+pub fn solve() {
+    let path = "res/03/input";
+
+    let contents = fs::read_to_string(path).expect("I/O error, wrong path?");
+    //let contents = io::BufReader::new(fs::File::open(path).expect("I/O error, wrong path?"));
+
+    let grid: Vec<Vec<char>> = contents
+        .lines()
+        .map(|l| l.chars().collect::<Vec<char>>())
+        .collect();
+
+    let mut possible_gears = HashMap::<(usize, usize), Vec<usize>>::new();
+
+    let result: usize = contents
+        .lines()
+        .enumerate()
+        .map(|(yusize, line)| {
+            let re = Regex::new(r"(\d+)").unwrap();
+            let y = yusize as i32;
+
+            let mut nums = Vec::<usize>::new();
+
+            for (_, mat) in re.find_iter(line).enumerate() {
+                if let Ok(number) = mat.as_str().parse::<usize>() {
+                    let x = mat.start() as i32;
+                    let len = number.to_string().len() as i32;
+                    let mut pos_to_check = vec![
+                        (x - 1, y - 1),
+                        (x - 1, y),
+                        (x - 1, y + 1),
+                        (x, y - 1),
+                        (x, y + 1),
+                        (x + len, y),
+                    ];
+                    for i in 0..len {
+                        pos_to_check.push((x + 1 + i, y - 1));
+                        pos_to_check.push((x + 1 + i, y + 1));
+                    }
+
+                    if pos_to_check
+                        .iter()
+                        .filter(|(x, y)| {
+                            *x >= 0 && *y >= 0 && *y < grid.len() as i32 && *x < line.len() as i32
+                        })
+                        .map(|(x, y)| {
+                            if grid[*y as usize][*x as usize] == '*' {
+                                possible_gears
+                                    .entry((*x as usize, *y as usize))
+                                    .or_insert(vec![])
+                                    .push(number);
+                            }
+                            (x, y)
+                        })
+                        .any(|(x, y)| {
+                            !grid[*y as usize][*x as usize].is_digit(10)
+                                && grid[*y as usize][*x as usize] != '.'
+                        })
+                    {
+                        nums.push(number)
+                    }
+                }
+            }
+            nums.iter().sum::<usize>()
+        })
+        .sum();
+
+    println!("Result 1: {}", result);
+
+    let result: usize = possible_gears
+        .iter()
+        .filter(|(_, vec)| vec.len() == 2)
+        .map(|(_, vec)| vec.iter().product::<usize>())
+        .sum();
+
+    println!("Result 2: {}", result);
+}
diff --git a/src/main.rs b/src/main.rs
index 6122656..ed339f5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,7 @@
 pub mod days;
 
 fn main() {
-    days::d02::solve()
+    days::d03::solve()
     //_all_days()
 }