diff --git a/0191_number-of-1-bits/python3/shift.py b/0191_number-of-1-bits/python3/shift.py
new file mode 100644
index 0000000..1dd8edc
--- /dev/null
+++ b/0191_number-of-1-bits/python3/shift.py
@@ -0,0 +1,9 @@
+class Solution:
+    def hammingWeight(self, n: int) -> int:
+        count = 0
+        
+        while n:
+            count += 1 if n & 1 == 1 else 0
+            n >>= 1
+        
+        return count
diff --git a/0191_number-of-1-bits/python3/solution.py b/0191_number-of-1-bits/python3/solution.py
index 1dd8edc..02dafcb 100644
--- a/0191_number-of-1-bits/python3/solution.py
+++ b/0191_number-of-1-bits/python3/solution.py
@@ -3,7 +3,7 @@ class Solution:
         count = 0
         
         while n:
-            count += 1 if n & 1 == 1 else 0
-            n >>= 1
+            n = n & (n - 1)
+            count += 1
         
         return count