diff --git a/2019/1/day1.py b/2019/1/day1.py
new file mode 100644
index 0000000..34eda6b
--- /dev/null
+++ b/2019/1/day1.py
@@ -0,0 +1,13 @@
+import sys
+from typing import List
+
+def cost(mass: int) -> int:
+    return mass // 3 - 2
+
+def cost_rec(mass: int) -> int:
+    c = cost(mass)
+    return 0 if c <= 0 else c + cost_rec(c)
+
+lines = [int(l) for l in sys.stdin.readlines()]
+print(f'Part 1: {sum(map(cost, lines))}')
+print(f'Part 2: {sum(map(cost_rec, lines))}')