diff --git a/2020/d03/ex1/ex1.py b/2020/d03/ex1/ex1.py
new file mode 100755
index 0000000..c964770
--- /dev/null
+++ b/2020/d03/ex1/ex1.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+import sys
+from typing import List, Tuple
+
+
+def solve(trees: List[str], delta: Tuple[int, int]) -> int:
+    x, y = 0, 0
+    sum = 0
+    while True:
+        x += delta[0]
+        y += delta[1]
+        if y >= len(trees):
+            break
+        sum += trees[y][x % len(trees[0])] == "#"
+    return sum
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input, (3, 1)))
+
+
+if __name__ == "__main__":
+    main()