文件目录

#include <bits/stdc++.h>
using namespace std;
int t[1100005];
int d, i;
int ans = 0;
void down(int r, int c)
{
    if (c == d)
        ans = r;
    if (t[r] == 0)
    {
        t[r] = 1;
        if (c != d)
            down(r * 2, c + 1);
    }
    else
    {
        t[r] = 0;
        if (c != d)
            down(r * 2 + 1, c + 1);
    }
}
int main()
{
    cin >> d >> i;
    while (i--)
    {
        down(1, 1);
    }
    cout << ans;
    return 0;
}