#include <bits/stdc++.h>
#define suiii ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define endl '\n'
#define ll long long
#define ld long double
#define clo cout << "Time execute: " << clock() / (double)CLOCKS_PER_SEC << " sec" << endl;
#define co cout <<
#define MOD 1000000007
#define all(x) x.begin(),x.end()
using namespace std;
//stuff
ll n,k;
pair<ll,ll>arr[1000001]={};
ll multi[21]={};
void solve(){
cin>>n>>k;
ll cnt=0;
ll last;
multi[0]=1;
for(int i=1;i<=n;i++){
multi[i]=multi[i-1]*2;
}
while(cnt!=k){
ll r=1;
for(int i=n;i>0;i--){
if(arr[i].second==1){
r+=multi[i]/2;
}
arr[i].first++;
if(arr[i].first%multi[n-i]==0){
arr[i].first=0;
arr[i].second=!arr[i].second;
}
}
cnt++;
last=r;
}
co last;
}
int main()
{
suiii
ll t=1;
//cin>>t;
while(t--){
solve();
}
return 0;
}
