#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
#include <map>
#include <math.h>
#include <deque>
#include <queue>
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    ll n,m; cin >> n >> m;
    ll res=m*(1LL<<(n-3));
    cout << res << endl;
}