#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define ll long long
#define str string
#define pb push_back
#define pf push_front
#define in insert
#define all(v) v.begin(),v.end()
const int sz=1000000,INF=1000000000;
using namespace std;
vector<ll>pow2;
void solve()
{
ll n,m,num;
cin>>n>>m;
vector<ll>nums;
num=pow2[n];
for(int i=1;i<=num/2;i+=2)
{
nums.pb(i),nums.pb(i+num/2);
}
for(int i=2;i<=num/2;i+=2)
{
nums.pb(i),nums.pb(i+num/2);
}
cout<<nums[m-1];
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr),cout.tie(nullptr);
for(int i=1;i<INF;i*=2)
{
pow2.pb(i);
}
ll t=1;
//cin>>t;
while(t--)
{
solve();
}
}
