diff --git a/Yousab-Nabil.md b/Yousab-Nabil.md
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+```c++
+#include<iostream>
+void main(){
+  long long num;
+  std::cout <<"enter the number " << std::endl;
+  std::cin >> num;
+  num = (num * (num + 1)) / 2;
+  std::cout << num << std::endl;
+}
+```