diff --git a/2017/d02/ex1/ex1.py b/2017/d02/ex1/ex1.py
new file mode 100755
index 0000000..01e3a88
--- /dev/null
+++ b/2017/d02/ex1/ex1.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+
+import sys
+
+
+def solve(input: str) -> int:
+    def parse(input: str) -> list[list[int]]:
+        return [[int(n) for n in line.split()] for line in input.splitlines()]
+
+    def checksum(row: list[int]) -> int:
+        return max(row) - min(row)
+
+    sheet = parse(input)
+    return sum(map(checksum, sheet))
+
+
+def main() -> None:
+    input = sys.stdin.read()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()