#include <fstream>
using namespace std;

ifstream in("fractal.in");
ofstream out("fractal.out");

int fractal(int k,int x,int y)
{
	if (!k)
		return 0;
	int cmp=1<<k-1;
	if (x<=cmp)
	{
		if (y<=cmp)
			return fractal(k-1,y,x);
		return cmp*cmp+fractal(k-1,x,y-cmp);
	}
	x-=cmp;
	if (y<=cmp)
		return 3*cmp*cmp+fractal(k-1,cmp-y+1,cmp-x+1);
	return 2*cmp*cmp+fractal(cmp<<1,x,y-cmp);
}

int main()
{
	int k,x,y;
	in>>k>>x>>y;
	out<<fractal(k,x,y)<<'\n';
	return 0;
}