using System;

public class Program

{

    public static void Main()

    {

        //Mathias Saldivar

        int num;

        int b=5

;

        Console.WriteLine("5, 13, 29, 61...");

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

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

        for (int m=2; m <= num ; m++)

        {

            b= 2*b+3;

        }

        Console.WriteLine(b);

    }

}