using System;

public class Program

{

    public static void Main()

    {

        add1(1,1);

        add1(1,1);

        //Console.WriteLine("Hello World");

    }

    public static void add1(int a,int b)

    {

        Console.WriteLine("sum is {0}",a+b);

    }

    public static void add1(int a,int b,out int c)

    {

        c=a+b;

        Console.WriteLine("sum is {0}",c);

    }

}