#include<stdio.h>
using namespace std;

#define lat (1 << ordin)

inline int fractal(int ordin, int x, int y)
{
	if(ordin == 0)
		return 0;
	ordin--;

	if(x <= lat && y <= lat)
		return fractal(ordin, y, x);
	if(x > lat && y <= lat)
		return lat * lat + fractal(ordin, x-lat, y);
	if(x > lat && y > lat)
		return 2 * lat * lat + fractal(ordin, x-lat, y-lat);
	return 3 * lat * lat + fractal(ordin, 2*lat-y+1, lat-x+1);
}

int main()
{
	int k, x, y;
	freopen("fractal.in", "r", stdin);
	freopen("fractal.out", "w", stdout);
	scanf("%d%d%d", &k, &y, &x);
	printf("%d\n", fractal(k, x, y));

	return 0;
}