using System;

​

public class Program

{

    public static void Main()

    {

        int num, count, sum = 0;

        Console.WriteLine("enter natural number");

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

        count = 0;

        while (0 != num)

        {

            sum += num;

            count++;

            Console.WriteLine("enter natural number");

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

        }

​

        Console.WriteLine(count);

        Console.WriteLine(sum / count);

    }

}