using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int num = Convert.ToInt16(Console.ReadLine());

        string abc = (Console.ReadLine());

        string def = "";

        for( int i=1; i<num; i++)

           {

            abc = abc + abc;

            Console.WriteLine(abc);

           }

    }

}