diff --git a/2019/d01/ex1/ex1.py b/2019/d01/ex1/ex1.py
new file mode 100755
index 0000000..9cc31eb
--- /dev/null
+++ b/2019/d01/ex1/ex1.py
@@ -0,0 +1,15 @@
+#!/usr/bin/env python
+import sys
+from typing import List
+
+
+def solve(nums: List[int]) -> int:
+    return sum(num // 3 - 2 for num in nums)
+
+
+def main() -> None:
+    print(solve(list(int(lines) for lines in sys.stdin)))
+
+
+if __name__ == "__main__":
+    main()