using System;

public class Program

{

    public static void Main()

    {

        //Santiago Sánchez

        int x; 

        int t=2;

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

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

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

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

        {

        t= 2*t+1;

        }

        Console.WriteLine(t);

    }

}