using namespace std;
#include <fstream>
ifstream fin("fractal.in");
ofstream fout("fractal.out");


int main()
{
    int k, xf, yf, rez = 0;
    fin >> k >> xf >> yf;
    while(k > 0)
    {
        --k;
        if(yf <= (1 << k))
        {
            if(xf <= (1 << k)) swap(xf, yf);
            else
            {
                rez += 3 * (1 << (2 * k));
                xf -= (1 << k);
            }
        }
        else
        {
            if(xf <= (1 << k)) rez += (1 << (2 * k)), yf = 2 * (1 << k) - yf + 1, xf = (1 << k) - xf + 1;
            else rez += 2 * (1 << (2 * k)), xf -= (1 << k), yf -= (1 << k);
        }
    }
    fout << rez << '\n';
    return 0;
}