diff --git a/Week1/Missing no/week1_pooja b/Week1/Missing no/week1_pooja
new file mode 100644
index 0000000..5f5f359
--- /dev/null
+++ b/Week1/Missing no/week1_pooja	
@@ -0,0 +1,16 @@
+class Solution {
+public:
+    int missingNumber(vector<int>& nums) {
+        
+        sort(nums.begin(), nums.end());
+        int missing = 0;
+        
+        for(int i = 0; i < nums.size(); i++)
+        {
+            if(missing != nums[i])
+                return missing;
+            missing++;
+        }
+        return missing;
+    }
+};