#include "bits/stdc++.h"
using namespace std;
using ll = long long;
vector<int> vis, ans;
int tt;
void rec(int x, int lx, int rx) {
if (rx - lx == 1) {
ans.push_back(rx);
return;
}
int md = (lx + rx) / 2;
if (vis[x] == 0) {
rec(2 * x + 1, lx, md);
} else {
rec(2 * x + 2, md, rx);
}
vis[x] = (vis[x] + 1) % 2;
}
void solve() {
int n, k;
cin >> n >> k;
n = pow(2, n);
vis.assign(2 * n + 1, 0);
rec(0, 0, n);
for (int i = 0; i < n; i++) {
rec(0, 0, n);
}
cout << ans[k - 1] << '\n';
}
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int test = 1;
// cin >> test;
while (test--) {
solve();
}
}
