#include <fstream>

using namespace std;
ifstream f("fractal.in");
ofstream g("fractal.out");
int k,t,s,x,y,i,aux;
int main()
{
   f>>k>>y>>x;
   t=1;

   for(i=1;i<=k;i++)
        t=t*2;
    while(k>0){
            if(x<=t/2){
                    if(y<=t/2){
                aux=x;
                x=y;
                y=aux;
            }
                    else{
                            s+=3*t*t/4;
                            y-=t/2;
                                aux=t/2-x+1;
                                x=t/2-y+1;
                                y=aux;
                    }}
                else{
                        if(y<=t/2){
                                s+=t*t/4;
                                x-=t/2;
                        }
                            else{
                                s+=t*t/2;
                                x-=t/2;
                                y-=t/2;
                            }
                }
            k--;
            t=t/2;

    }
    g<<s;
     return 0;
}