#include <fstream>
using namespace std;
ifstream fi("fractal.in");
ofstream fo("fractal.out");
int k,x,y;
 
int rez(int k, int x, int y)
{if (k==1) return 0;
 
k=k/2;
if (x<=k and 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,k-(x-k)+1);
 return  k*k*2 + rez(k,x-k,y-k);
}
 
 
int main()
{
    fi>>k>>x>>y;
    fo<<rez(1<<k,x,y);
 
    return 0;
}