using System;

using System.Runtime;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine("Attempt 1 mins" + DelaysInSeconds(1) / 60);

        Console.WriteLine("Attempt 2 mins " + DelaysInSeconds(2) / 60);

        Console.WriteLine("Attempt 3 mins " + DelaysInSeconds(3) / 60);

    }

    public static int DelaysInSeconds(int attempt)

    {

        return (int) Math.Pow(2, attempt - 1) * 30 * 60;

    }

}