#include<fstream>
using namespace std;
ifstream in("fractal.in"); 
ofstream out("fractal.out");

int k,x,y;

int rez(int k,int x,int y)
{   
	if(k==1) 
		return 0;
    k/=2;
    if(x<=k&&y<=k) 
		return rez(k,y,x);
    if(x<=k) 
		return k*k+rez(k,x,y-k);
    if(y<=k) 
		return k*k*3+rez(k,k-y+1,2*k-x+1);
    return k*k*2+rez(k,x-k,y-k);
}
int main()
{
	int player_unu=0;
	in>>k>>x>>y;

    out<<rez(1<<k,x,y); 
	return player_unu;
}