#include <cstdio>

using namespace std;

inline int Fractal (int K, int X, int Y)
{
	if (K==0) return 0;
	int Mid=1<<(K-1), Size=Mid*Mid-1;
	if (X<=Mid and Y<=Mid)
	{
		return Fractal (K-1, Y, X);
	}
	if (X>Mid and Y<=Mid)
	{
		return Size+1+Fractal (K-1, X-Mid, Y);
	}
	if (X>Mid and Y>Mid)
	{
		return 2*Size+2+Fractal (K-1, X-Mid, Y-Mid);
	}
	if (X<=Mid and Y>Mid)
	{
		return 3*Size+3+Fractal (K-1, 2*Mid-Y+1, Mid-X+1);
	}
	return 0;
}

int main ()
{
	freopen ("fractal.in", "r", stdin);
	freopen ("fractal.out", "w", stdout);
	int K, X, Y; scanf ("%d %d %d", &K, &X, &Y);
	printf ("%d\n", Fractal (K, Y, X));
	return 0;
}