import java.util.*;
public class Test3 {

    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        int input = reader.nextInt();
        int[][] myArr = new int[input][input];
        long filler = 1;
        long colFiller = filler;
        long sum = 0;

        for (int i = 1; i <input ; i++,filler*=2,colFiller=filler) {
            for (int j = 0; j <i ; j++) {
                colFiller*=2;
                sum+=colFiller;
            }
        }
        System.out.println(sum);
    }
}