using System;

public class Program

{

    public static void Main()

    {

        //Luis Felipe

        int n;

        int total = 0;

        Console.WriteLine("Please write as many numbers you want and when you write zero I'll tell you the highest number");

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

         total = n;

        while (n!=0)

        {

            Console.WriteLine("Write another number");

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

            if(total < n)

            {

                total=n;

            }

        }

        Console.WriteLine("The highest number is " + total);

    }

}