using System;

public class Program

{

    public static void Main()

    {

            int  gard, sum;

            double avrg = 0;

            avrg = 0;

            gard = 0;

            sum = 0;

​

            sum += gard;

            while (gard != -1)

            {

                Console.WriteLine("write gard");

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

                Console.WriteLine("your gard : {0}", gard);

​

                avrg = gard / sum;

                Console.WriteLine("your avrg : {0}", avrg);

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

            }

    }

}