using System;

public class SumInts

{

    public static void Main()

    {

        int sum =0;

        int Read = 0;

        Console.WriteLine("Insert the numbers you want to add then insert 999 to get the result");

        while( Read != 999 )

        {

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

            if ( Read == 999 );

            else 

                sum = sum + Read;

        }

            Console.WriteLine("The sum of you numbers is {0}", sum);

    }

}