1.6-3

import java.math.BigInteger;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num = scanner.nextInt();
        BigInteger two = BigInteger.TWO;
        for (int i = 1;i<num;++i){ two = two.multiply(BigInteger.TWO); }
        two = two.subtract(BigInteger.ONE);
        System.out.println(two);
    }
}