diff --git a/mohamed-elsayed.md b/mohamed-elsayed.md
new file mode 100644
index 0000000..dddf4ea
--- /dev/null
+++ b/mohamed-elsayed.md
@@ -0,0 +1,10 @@
+#include<iostream>
+using namespace std ;
+
+int sum(int n){
+int sum=0;
+for (int i=0;i<=n;i++){
+sum+=i;
+}
+return sum;
+}