#include <iostream>
#include <cmath>

using namespace std;

int main()
{
	int N, K;
	cin >> N >> K;
	int x_max, x;
	x_max = pow(2, N);
	x = pow(2, K);
	if (x <= x_max)
		cout << x_max / x << endl;
	else
		cout << 0 << endl;
}