#include<fstream>
using namespace std;
ifstream r("fractal.in");
ofstream w("fractal.out");
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 k,x,y;
int main(){
 r>>k>>x>>y;
 w<<rez(1<<k,x,y);return 0;
}