diff --git a/abdalrahman_khedr.md b/abdalrahman_khedr.md
new file mode 100644
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+++ b/abdalrahman_khedr.md
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+\#include <iostream>
+
+using namespace std;
+
+int main()
+
+{
+
+&nbsp;   int n;
+
+&nbsp;   int sum = 0;
+
+&nbsp;   cout << "enter a number: ";
+
+&nbsp;   cin >> n;
+
+
+
+&nbsp;   for (int i = 0; i <= n; i++)
+
+&nbsp;   {
+
+&nbsp;       sum += i;
+
+&nbsp;   }
+
+
+
+&nbsp;   cout << sum;
+
+}
+