public class Euler190 {
    public static void main(String[] args) {
        long total = 0;
        for (int m = 2; m <= 15; m++) {
            double logSum = 0;
            for (int i = 1; i <= m; i++) {
                double xi = 2.0 * i / (m + 1);
                logSum += i * Math.log(xi);
            }
            total += (long) (Math.exp(logSum) + 1e-12);
        }
        System.out.println(total);
    }
}