diff --git a/LeetCode/0258_Add_Digits.py b/LeetCode/0258_Add_Digits.py
new file mode 100644
index 0000000..8f0800c
--- /dev/null
+++ b/LeetCode/0258_Add_Digits.py
@@ -0,0 +1,5 @@
+class Solution:
+    def addDigits(self, num: int) -> int:
+        if num < 10: return num
+        if num % 9 == 0: return 9
+        return num % 9