using System;

​

public class Program

{

    public static void Main()

    {

        // marianne ramos trujillo

        int position;

        int num = 5;

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

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

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

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

        {

            num = 2 * num + 3;

        }

​

        Console.WriteLine(num);

        ;

    }

}