#include <fstream>
using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");
long int n,tmp,x,y,len,mat[3][3],x1,y1;
int divimp(int n, int x, int y)
{
    if(n<=0)
    {
        x1=x;
        y1=y;
        return 0;
    }
        len= 1<< n;
        if(x<=len&&y<=len)
            return 1ll*divimp(n-1,y,x);
        if(x<=len&&y>len)
            return 1ll*3*len*len+divimp(n-1,x,y-len);
        if(x>len&&y<=len)
            return 1ll*len*len+divimp(n-1,x-len,y);
        if(x>len&&y>len)
            return 1ll*2*len*len+divimp(n-1,x-len,y-len);

}
int main()
{
fin>>n>>x>>y;
    tmp=n;
    mat[1][1]=0;
    mat[2][1]=1;
    mat[2][2]=2;
    mat[1][2]=3;
    fout<<divimp(tmp,x,y)+mat[x1][y1];
    return 0;
}