#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//const long nPrime = 1000000007;
//const long nPrime = 998244353;
typedef long long ll;

int main() {
    ll n,m;
    cin >> n >> m;
  
    ll nOrd = 1;
    for(ll i = 0; i < n-1; i++){
        nOrd *= 2;
        if(nOrd > m){
            break;
        }
    }
    if(nOrd < m){
        cout << 2*nOrd-1 <<endl;
        return 0;
    }
   
    ll nAns = 0;
    ll nTmp = n;
    while(m>1){
        nAns += m;
        m = (m+1)/2;
        nTmp--;
    }
    cout << nAns+nTmp << endl;
    return 0;
}