diff --git a/Missing Number Solution b/missing-Number.cpp
similarity index 100%
rename from Missing Number Solution
rename to missing-Number.cpp
diff --git a/temp3.cpp b/temp3.cpp
new file mode 100644
index 0000000..3f5fe01
--- /dev/null
+++ b/temp3.cpp
@@ -0,0 +1,11 @@
+class Solution {
+public:
+    int missingNumber(vector<int>& nums) {
+        int n = nums.size();
+        int sum = 0;
+        for(int i = 0; i < n; i++) {
+            sum += nums[i];
+        }
+        return n*(n+1)/2 - sum;
+    }
+};
\ No newline at end of file