diff --git a/2021/d07/ex1/ex1.py b/2021/d07/ex1/ex1.py
new file mode 100755
index 0000000..4205009
--- /dev/null
+++ b/2021/d07/ex1/ex1.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+
+import itertools
+import sys
+from typing import List
+
+
+def solve(input: List[str]) -> int:
+    nums = sorted(int(n) for n in input[0].split(","))
+    median = nums[len(nums) // 2]
+
+    return sum(abs(n - median) for n in nums)
+
+
+def main() -> None:
+    input = [line.strip() for line in sys.stdin.readlines()]
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()