using System;

public class Program

{

    Int64 Sum (int n) {

            int sum, i;

​

            for (i = 0; i < n; i++)

                sum = i + 1;

​

            return n;

​

​

            Console.WriteLine(n);

        }

​

    }

​

    public static void Main()

    {

    }

}

​