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

int main() {
    long long N,X;
    cin >> N >> X;
    long long sum = 0,cnt = 0;
    while (X != 1) {
        cnt++;
        sum += X;
        if(X%2 == 0) {
            X /= 2;
        }
        else {
            X = (X+1)/2;
        }
    }
    if(cnt > N) {
        long long ans = 0;
        sum = 1;
        for(int i = 0; i < N; i++) {
            ans += sum;
            sum *= 2;
        }
        cout << ans << endl;
    }
    else {
        cout << sum+(N-cnt) << endl;
    }
}