#include <bits/stdc++.h>

using namespace std;

ifstream in("fractal.in");
ofstream out("fractal.out");

int solve(int grad, int x, int y)
{
    if(grad == 1)
    {
        if(x == 1 && y == 1)
            return 0;

        if(x == 1 && y == 2)
            return 3;

        if(x == 2 && y == 1)
            return 1;

        return 2;
    }

    int p = (1 << (grad - 1));

    if(x <= p && y <= p)
    {
        return solve(grad - 1, y, x);
    }

    if(x > p && y <= p)
    {
        return p * p + solve(grad - 1, x - p, y);
    }

    if(x > p && y > p)
    {
        return p * p * 2 + solve(grad - 1, x - p, y - p);
    }

    if(x <= p && y > p)
    {
        return p * p * 3 + solve(grad - 1, 2 * p - y + 1, p - x + 1);
    }
}

int main()
{
    int k, x, y;
    in >> k >> x >> y;

    out << solve(k, y, x);

}