using System;

​

public class Program

{

    public static void Main()

    {

        // Zyanya Arévalo Amador

        int posi;

        int num = 2;

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

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

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

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

        {

            num = 2 * num + 1;

        }

​

        Console.WriteLine(num);

    }

}