#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#define line() "author : AyazN";
#endif
#define all(x) (x).begin(), (x).end()
#define isz(x) (int)(x.size())
#define int ll
typedef long double ld;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pii> vpii;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
const int sz = 500000, inf = 1000000000, LOG = 20;
const ll mod = 1000000007, INF = 1000000000000000000;
int ans = 0, k, base, d, n;
int f(int x) {
if (x == 1)
return base;
if (x == (1LL << (n - 1)) + 1)
return base;
int p = 1;
while (p < x) p <<= 1LL;
p >>= 1LL;
return f(x - p) + d / p;
}
// vector<int> ans1;
// int st[sz << 2];
// void f1(int l, int r, int v) {
// if (l == r) {
// ans1.push_back(l);
// st[v]++;
// return;
// }
// int mid = (l + r) >> 1;
// if (st[v<<1] > st[v<<1|1]) f1(mid + 1, r, v<<1|1);
// else f1(l, mid, v<<1);
// st[v] = st[v<<1] + st[v<<1|1];
// }
void run_case(int tc) {
// n = rng() % 30 + 1;
// k = rng() % (1 << n) + 1;
// ans1.clear();
// memset(st, 0, sizeof(st));
// for (int i = 1; i <= k; i++)
// f1(1, (1LL << n), 1);
// int p = 1;
// while (p < k) p <<= 1;
// d = p;
int n, k; cin >> n >> k;
d = (1LL << (n - 1));
n = min(60LL, n);
if ((1LL << (n - 1)) < k) {
base = 2;
k -= (1LL << (n - 1));
}
else base = 1;
int ans = f(k);
cout << ans << '\n';
// if (ans != ans1.back()) {
// debug(ans1, d);
// cout << ans1.back() << ' ' << ans << '\n';
// cout << n << ' ' << k << '\n';
// exit(0);
// }
}
void precompute() {}
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
#ifdef LOCAL
// freopen("err.log", "w", stderr);
#endif
precompute();
int t = 1; // e2; cin >> t;
for (int tc = 1; tc <= t; tc++) {
run_case(tc);
}
}
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