using System;

public class Program

{

    public static void Main()

    {

        //Ana Paola Mejia Rodriguez 

        int x;

        int y;

        Console.WriteLine("Hi!!! Write a number");

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

        y=x;

        while(x !=0)

        {

            Console.WriteLine(" Please write a number:");

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

            if(x>y)

            {

            y =x;   

            }

        }

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

    }

}