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

const int dx[4] = {-1, 0, 1, 0}, dy[4] = {0, 1, 0, -1};
const ll mod = 998244353;

int main() {
    int N, M; cin >> N >> M;
    ll ans = M;
    int cnt = 1;
    while (M > 1) {
        if (M % 2 == 0) {
            M /= 2;
            ans += M;
        }
        else {
            M = M / 2 + 1;
            ans += M;
        }
        cnt++;
    }
    while (cnt < N) {
        cnt++;
        ans++;
    }
    cout << ans << endl;
}