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+```C#
+using System;
+
+namespace Summition{
+
+    public static class Program{
+
+        public static void Main(){
+
+            int n;
+            Console.Write("Inter an integer number : ");
+            n = int.Parse(Console.ReadLine());
+
+            int sum = (n*(n+1))/2 ;
+
+            Console.WriteLine($"Result is {sum}");
+
+        }
+    }
+}
+```