#include <fstream>

using namespace std;

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

int divide (int x, int y, int k) {
    if (k == 0)
        return 0;
    --k;
    int l = (1 << k);
    if (x <= l && y <= l)
        return divide (y, x, k);
    if (x > l && y <= l)
        return l*l + divide (x-l, y, k);
    if (x > l && y > l)
        return 2*l*l + divide (x-l, y-l, k);
    return 3*l*l + divide (2*l - y + 1, l - x + 1, k);
}

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

    f >> k >> x >> y;

    g << divide (y, x, k) << "\n";

    return 0;
}