using System;

public class Program

{

    public static void Main()

    {

        int pri,i=1,amo=0;

        Console.Write("Please enter the price of the product. \n {0}.",i);

        pri=int.Parse(Console.ReadLine());

        while (pri>0)

        {

        amo=amo+pri;

        i=i+1;

        Console.Write("{0}.",i);

        pri=int.Parse(Console.ReadLine());

        }

        i=i-1;

        Console.WriteLine("the number of the product is {0} ",i);

        Console.WriteLine("You need to pay {0} shekels",amo);

    }

}