using System;

​

public class Program

{

    public static void Main()

    {

        int sum, height, count;

        double  avg;

        Console.WriteLine("enter height");

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

        sum = 0;

        count = 0;

        while (height != 0)

        {

            sum = sum + height;

            Console.WriteLine("enter height");

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

            count++;

        }

        avg = sum / count;

        Console.WriteLine(avg + " average");

    }

}