using System;

public class Program

{

    public static double Pi(int step)

    {

     if (step == 24)

     {      

        return 0;

     } 

     step = step + 1;

     return (2*step - 1 + ((step*step) / Pi(step)));

    }   

    public static void Main()

    {

        Console.WriteLine("Hello World "+4/Pi(0));

    }

}