#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define F first
#define S second
#define all(v) v.begin(),v.end()
typedef vector<int> vi;
typedef vector<char> vc;
typedef pair<int,int> ii;
typedef vector<ii> vii;
typedef set<int> si;
typedef map<int,int> mii;
const int INF = 2e5 + 100;
int cal(int s,int e,int k){
//cout << s << " " << e << " " << k << endl;
if (k == 1) return s;
int m = (e - s + 1) / 2;
if (k%2 == 1){
return cal(s,s + m -1, (k+1) / 2);
}
else return cal(s + m,e , (k+1) / 2);
}
int32_t main(){
ios_base::sync_with_stdio(NULL);cin.tie(NULL);cout.tie(NULL);
int n,k;
cin >> n >> k;
cout << cal(1,(1 << n),k);
return 0;
}
