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());;
}