diff --git a/medium/check_if_number_is_a_sum_of_powers_of_three.py b/medium/check_if_number_is_a_sum_of_powers_of_three.py
new file mode 100644
index 0000000..bff8a10
--- /dev/null
+++ b/medium/check_if_number_is_a_sum_of_powers_of_three.py
@@ -0,0 +1,11 @@
+# https://leetcode.com/problems/check-if-number-is-a-sum-of-powers-of-three
+
+class Solution:
+    def checkPowersOfThree(self, n: int) -> bool:
+        while n > 0:
+            if n % 3 == 2:
+                return False
+            n //= 3
+        return True
+
+