#include <fstream>
using namespace std;

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

int k,x,y;

int fractal(int k,int x,int y)
{int t,p;
t=1<<(k-1);
p=t*t;

if(k==0)
return 0;

if(x<=t&&y<=t)
return fractal(k-1,y,x);

if(x<=t&&y>t)
return p+fractal(k-1,x,y-t);

if(x>t&&y>t)
return 2*p+fractal(k-1,x-t,y-t);

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

int main()
{f>>k>>x>>y;
g<<fractal(k,x,y);

    return 0;
}