diff --git a/231-power-of-two/231-power-of-two.py b/231-power-of-two/231-power-of-two.py
new file mode 100644
index 0000000..b11e53a
--- /dev/null
+++ b/231-power-of-two/231-power-of-two.py
@@ -0,0 +1,5 @@
+class Solution:
+    def isPowerOfTwo(self, n: int) -> bool:
+        if n < 0:
+            return False
+        return bin(n).count("1") == 1
\ No newline at end of file