#include <fstream>
using namespace std;ifstream f("fractal.in");ofstream g("fractal.out");
int K,X,Y;int Fractal(int k,int x,int y)
{if(k==1)return 0;k/=2;
if(x<=k&&y<=k)return Fractal(k,y,x);
if(x<=k&&y>k)return k*k+Fractal(k,x,y-k);
if(x>k&&y>k)return 2*k*k+Fractal(k,x-k,y-k);
if(x>k&&y<=k)return 3*k*k+Fractal(k,k+1-y,(k<<1)+1-x);}
int main(){f>>K>>X>>Y;g<<Fractal(1<<K,X,Y);}