#include <stdio.h>
#include <stdlib.h>

#define FIN "fractal.in"
#define FOUT "fractal.out"
#define PATRAT(t) (t*t)

int fractal(int ord, int x, int y){
	int m;
	if(ord < 0){
		return 0;
	}
	m = 1<<ord;
	if(x <= m && y <= m){
		return fractal(ord-1, y, x);
	} else if ( x > m && y <= m) {
		return PATRAT(m) + fractal(ord-1, x-m, y);
	} else if ( x > m && y > m) {
		return 2*PATRAT(m) + fractal(ord-1, x-m, y-m);
	}   return 3*PATRAT(m) + fractal(ord-1, 2*m-y+1, m-x+1);
	
}

int main(){
	FILE *in, *out;
	int ord, x, y;
	in = fopen(FIN, "rt");
	out = fopen(FOUT, "wt");
	
	fscanf(in, "%d%d%d", &ord, &x, &y);
	fprintf(out, "%d", fractal(ord,x,y));
	
	return 0;
}