using System;

public class Program

{

    public static void Main()

    {

        //Nemy Edlyn Hernández Luna

        int num;

        int xd = 5;

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

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

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

​

        for (int n = 1; n < num; n++)

        { 

            xd = 2*xd + 3;

        }

        Console.WriteLine(xd);

    }

}