#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int n, m;

long long Solve(int x, int y){
    if(x == 1)    return y-1;
    long long u = Solve(x/2, y);
    if(x & 1)   return u + u + 1 + y;
    return u + u + 1;
}


int main() {
    cin >> n >> m;
    cout << Solve(n, m);
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}