using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<int> block = new List<int>();

        for(int i = 0;i < block.Count - 1 ;i++)

        {

          Console.Write(block[i].ToString());

            if(i < 

        }

        Console.WriteLine("Hello World");

    }

}