using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int sum = 0;

        int count = 0;

        while (sum < 1000)

        {

            Console.WriteLine("enter a number");

            sum += int.Parse(Console.ReadLine());

            count ++;

        }

            Console.WriteLine("the avrege of your numbers is :{0}" , sum / count);

    }

}