using System;

public class Program

{

    public static void Main()

    {

        //Louis Ramiro Alicea Hernández

        Console.WriteLine(".. 5, 11, 23, 47 ... ");

        Console.WriteLine(" what position of the series you would like to know?");

        int position;

  int num = 2;

        position = int.Parse(Console.ReadLine());

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

{

    num = 2*num +1;

}

​

Console.WriteLine(num);

​

    }

}

​