#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
const int N=1e5;
vector<int>v;
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n,k;
cin>>n>>k;
int x=1;
int h=0;
while(1){
v.pb(x);
if(h== (1<< (n-1)))break;
h++;
x+= ( 1<<(n-1));
v.pb(x);
h++;
if(h== (1<< (n-1)))break;
x-= (1<< (n-2));
}
x=2;
h=0;
while(1){
v.pb(x);
if(h== (1<< (n-1)))break;
h++;
x+= ( 1<<(n-1));
v.pb(x);
h++;
if(h== (1<< (n-1)))break;
x-= (1<< (n-2));
}
for(int i=0;i<v.size();i++){
if(v[i]==k){
cout<<i+1;
}
}
}
