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