using System;

public class Program

{

    public static void Main()

    {

        //Hector Villa Rico

        int x;

        int y=2;

        Console.WriteLine("2, 5, 11, 23, 47");

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

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

        for(int f=1;f<x ; f++)

        {

            y=2*y+1;

        }

        Console.WriteLine(y);

    }

}