using System;

public class Program

{

    public static void Main()

    {

        var mBool = true;

        var N = 4;

        for(int i = mBool ? 0 : N-1 ; mBool ? i < N : i >= 0 ; i += mBool ? 1 : -1)

            Console.WriteLine("Hello World " + i);

        mBool = false;

        for(int i = mBool ? 0 : N-1 ; mBool ? i < N : i >= 0 ; i += mBool ? 1 : -1)

            Console.WriteLine("Hello World " + i);

    }

}