#include <bits/stdc++.h>
#define pb push_back
#define int long long
using namespace std;
const int N=2e5+5;
void get(vector<int> &v)
{
if(v.size()==1) return;
vector<vector<int>> aux(2);
for(auto x:v) aux[x&1].pb((x+1)/2);
get(aux[0]);get(aux[1]);
for(int i=0;i<v.size()/2;++i) v[i]=aux[0][i]*2-1;
for(int i=v.size()/2;i<v.size();++i) v[i]=aux[0][i-v.size()/2]*2;
}
signed main()
{
ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
int n,k;
cin>>n>>k;
vector<int> v;
for(int i=1;i<=(1<<n);++i) v.pb(i);
get(v);
cout<<v[k-1];
}
