using System;

public class Calculation

{

    void sum(int a,long b)

    {

Console.WriteLine(a+b);

    }

    void sum(int a,int b,int c)

    {

Console.WriteLine(a+b+c);

    }

    public static  void main(String[] args)

    {

Calculation c1=new Calculation();

        c1.sum(20,20);

        c1.sum(20,20,20);

    }

}

​