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#include <fstream>
using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");
int k,x,y;
int Fractal(int k, int x, int y)
{
if(k == 0) return 0;
int mij = (1 << (k-1));
int fractal = mij * mij;
if(x <= mij && y <= mij) return Fractal(k-1, y, x);
if(x <= mij && y > mij) return 3*fractal + Fractal(k-1, 2*mij-y+1, mij-x+1);
if(x > mij && y <= mij) return fractal + Fractal(k-1, x-mij, y);
if(x > mij && y > mij) return 2*fractal + Fractal(k-1, x-mij, y-mij);
}
int main()
{
fin >> k >> y >> x;
fout << Fractal(k, x, y) << '\n';
fout.close();
return 0;
}