diff --git a/leetcode/7.py b/leetcode/7.py
index 3d6ae2f..ee5908d 100644
--- a/leetcode/7.py
+++ b/leetcode/7.py
@@ -7,7 +7,8 @@ class Solution:
         reverse_str_x = str_x[::-1]
         if reverse_str_x[-1] == "-":
             reverse_str_x = "-" + reverse_str_x[:-1]
-        return int(reverse_str_x) if int(reverse_str_x) <= 2**31 - 1 else 0
+        return_x = int(reverse_str_x)
+        return return_x if return_x <= 2**31 - 1 and return_x >= -(2**31) else 0
 
 
 if __name__ == "__main__":