#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;
using PL = pair<ll, ll>;
// Welcome to my source code!

int main() {
    ll n, k;
    cin >> n >> k;
    ll x = 1, y = 1;
    for (int i = 0; i < n; i++) x *= 2;
    for (int i = 0; i < k; i++) y *= 2;
    cout << x / y << endl;
}