#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
const int INF=1e18;
#define no "NO"
#define yes "YES"
#define pb push_back
void solve(){
int n;
cin>>n;
int x;
cin>>x;
if(x<=pow(2,n)/2){
if(x%2==1){
cout<<x;
}
else{
cout<<x+pow(2,n-1)-1;
}
}
else{
if(x%2==0){
cout<<x;
}
else{
cout<<x-pow(2,n-1)+1;
}
}
}
/**
*(1 2)
* 1 17 1 2
* 3 19 3 4
* 5 21 5 6
* 7 23 7 8
* 9 25 9 10
* 11 27 11 12
* 13 29 13 14
* 15 31 15 16
*
*
* 2 18 17 18
* 4 20 19 20
* 6 22 21 22
* 8 24 23 24
* 10 26 25 26
* 12 28 27 28
* 14 30 29 30
* 16 32 31 32
*/
signed main(){
int t=1;//cin>>t;
while(t--){
solve();
cout<<endl;
}
}//
