#include <fstream>
#include <math.h>

using namespace std;

int main()
{
    ifstream is("fractal.in");
    ofstream os("fractal.out");

    unsigned ord, x, y, mv(0), dim;

    is >> ord >> x >> y;

    dim = pow(2, ord);

    do
    {
        dim /= 2;

        if((x <= dim)&&(y <= dim))
        {
            unsigned aux = x;
            x = y;
            y = aux;
        }
        if((x <= dim)&&(y > dim))
        {
            mv += dim*dim;

            y -= dim;
        }
        if((x > dim)&&(y > dim))
        {
            mv += dim*dim*2;

            x -= dim;
            y -= dim;
        }
        if((x > dim)&&(y <= dim))
        {
            mv += dim*dim*3;

            x -= dim;

            unsigned aux = x;
            x = ord + 1 - y;
            y = ord + 1 - aux;
        }

    }while(dim != 1);

    os << mv;

    os.close();
    is.close();

    return 0;
}