using System;

using System.Collections.Generic;

using System.Linq;

using static System.Console;

public class Program

{

    public static void Main()

    {

        var numLst = new List<int>();

        string input =  string.Empty;

        int number = 0;

        do

        {

          WriteLine("Enter an number || enter 0 to end");

          input = Console.ReadLine();

            if(Int32.TryParse(input, out number))

            {       

             numLst.Add(number);                

            }

        }while(input != "0");

        int sum = numLst.Sum();

        var average = sum / (numLst?.Count() - 1);

        WriteLine($"Average is : {average}");

    }

}