#include <stdio.h>

FILE *f,*s;

int k,x,y,z;

void Rezolva(int k,int x, int y)
{
	if(k==0) return;
	
	int l=1<<(k-1);
	
	if(x<=k&&y<=k) Rezolva(k-1,x,y); // Cadran 1
	
	if(x>k&&y<=k) { z+=l*l; Rezolva(k-1,x-l,y); } // Cadran 2
	
	if(x>k&&y>k)  { z+2*l*l; Rezolva(k-1,x-l,y-l); } //Cadran 3
	
	if(x<=l&&y>l) { z+=3*l*l; Rezolva(k-1,2*l-y+1,l-x+1); } //Cadran 4
}

int main()
{
	f=fopen("fractal.in","r");
	s=fopen("fractal.out","w");
	
	fscanf(f,"%d %d %d",&k,&x,&y);
	
	Rezolva(k,x,y);
	
	fprintf(s,"%d",z);
	
	fclose(s);
	
	return 0;
}