#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 nAns = 0;
    while(m>1 && n > 0){
        nAns += m;
        m = (m+1)/2;
        n--;
    }
    cout << nAns+n << endl;
    return 0;
}