#include <bits/stdc++.h>
#define PI 3.14159265359
using namespace std;
const int64_t mod = 1e9 + 7;

int main() {
	int L, N;
	cin >> L >> N;

	if (L == 3) {
		cout << N << endl;
		return 0;
	}

	string S;
	int sum = 0;
	for (int i = 0; i < N; i++) {
		int n = 1;
		for (int j = 0; j < L - 3; j++) {
			n *= 2;
		}

		sum += n;
	}

	cout << sum << endl;
}