#include <fstream>

using namespace std;

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

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

int main()
{
    int k, x, y;
    in >> k >> x >> y;
    out << compute((1 << k), x, y);
    return 0;
}