#include <fstream>

using namespace std;

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

int n,x,y,aux=1,m;

int main(){
	in>>n>>x>>y;
	for(int i=1;i<n;i++){
		aux=aux*2;
	}
	while(n>=2){
		if(x<aux){
			if(y>=aux){
				m+=aux*2;
			}
			else{
				aux=aux/2;
				n--;
				x=x+y;
				y=x-y;
				x=x-y;
				continue;
			}
		}
		else{
			if(y<=aux)
				m+=3*aux*2;
			else
				m+=4*aux;
		}
		y=y/2;
		x=x/2;
		if(y==0)
			y=1;
		if(x==0)
			x=1;
		x=x+y;
		y=x-y;
		x=x-y;
		aux=aux/2;
		n--;
	}
	if(x==1){
		if(y==2){
			m+=3;
		}
		else{
			m++;
		}
	}
	else{
		if(y==1){
			m++;
		}
		else{
			m+=2;
		}
	}
	out<<m;
	return 0;
}