using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int i = 500;

        Console.WriteLine(string.Format("Hello World {0}", i.ToString("00000000")));

            i = 12345678;

        Console.WriteLine(string.Format("Hello World {0}", i.ToString("00000000")));

                 i = 2;

        Console.WriteLine(string.Format("Hello World {0}", i.ToString("00000000")));

    }

}