using System;

public class Program

{

    public static void Main()

    {

        //Marifer Ortega

        int num1;

        int tot = 0;

        double a = 0;

        double num2 = 0;

        Console.WriteLine("Write as many number as you want but once you write zero I´ll tell you the average of how many numbers you wrote");

        num1 = int.Parse(Console.ReadLine());

        num2 += num1;

        while ( num1 != 0 ) 

        {

        num1 = int.Parse(Console.ReadLine());

        num2+= num1;

        tot++;

        }

        a = num2 / tot;

            Console.WriteLine("The avarage of the numbers you wrote before writing a zero is:" + " " + a);

    }

}