diff --git a/src/Test191.kt b/src/Test191.kt
new file mode 100644
index 0000000..dba7b9c
--- /dev/null
+++ b/src/Test191.kt
@@ -0,0 +1,20 @@
+class Test191 {
+    class Solution {
+        fun hammingWeight(n: Int): Int {
+            var result = 0
+            var num = n
+            while (num != 0){
+                result += num%2
+                num = num.shr(1)
+            }
+            return result
+        }
+    }
+
+    fun test(){
+        println(Solution().hammingWeight(11))
+        println(Solution().hammingWeight(128))
+        println(Solution().hammingWeight(2147483645))
+
+    }
+}
\ No newline at end of file