using System;

public class Program

{

    public static void Main()

    {

        Ned obc = new Ned();

        Console.WriteLine("Let's add infinite numbers");

        Console.Write("Enter the first number: ");

        obc.fn = Convert.ToInt32(Console.ReadLine());

        Console.Write("Enter the second number: ");

        obc.sn = Convert.ToInt32(Console.ReadLine());

        obc.addfirsttwo();

        Console.Write("Enter the another number: ");

        obc.tn =  Convert.ToInt32(Console.ReadLine());

        Console.WriteLine(obc.add(obc.tn, obc.sn));

        while (true){

            int x;

            Console.Write("Enter the another number: ");

            x =  Convert.ToInt32(Console.ReadLine());

            if (x != 0 ){

                obc.sn = obc.tn;

                obc.tn = x;

                Console.WriteLine(obc.add(x, obc.sn));

            }else if (x == 0) {

                Console.WriteLine("You entered zero, program ended");

                break;

            }

        }

    }

}

public class Ned {

    public int fn{get; set;}

    public int sn{get; set;}

    public int tn{get; set;}

    public void addfirsttwo(){

        int z =  fn + sn;

        Console.WriteLine(z);

    }

    public int add(int x, int y){

        int z = x + y;

        return z;

    }

}