#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    int N, K; cin >> N >> K;
    ll twoN = 1, twoK = 1;
    for(int i = 0; i < N; ++i) twoN *= 2;
    for(int i = 0; i < K; ++i) twoK *= 2;
    ll ans = twoN / twoK;
    cout << ans << endl;
}