diff --git a/sqrt.cpp b/sqrt.cpp
new file mode 100644
index 0000000..0474112
--- /dev/null
+++ b/sqrt.cpp
@@ -0,0 +1,13 @@
+class Solution {
+public:
+    int mySqrt(int x) {
+        if(x<2){
+            return x;
+        }
+        long long int i=2;
+        while(i*i<=x){
+            i+=1;
+        }
+        return --i;
+    }
+};