#include<fstream>
using namespace std;
ifstream f("fractal.in");
ofstream g("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,y,2*k+1-x);
    return k*k*2+rez(k,x-k,y-k);
}
int main()
{
    f>>k>>x>>y;
    g<<rez(1<<k,x,y);
    return 0;
}