#include <fstream>

using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");

long long fractal(int dim,int lin,int col)
{
    //fout<<lin<<" "<<col<<"\n";
    if(dim==2)
        {
            if(lin%2==1 && col%2==1) return 1;
            if(lin%2==0 && col%2==1) return 2;
            if(lin%2==0 && col%2==0) return 3;
            return 4;
        }

    int val=dim*dim/4;
    ///stanga jos
    if(lin>dim/2 && col<=dim/2)
        {
            lin=lin;
            col=col;
            return val+fractal(dim/2,lin,col);
        }
    ///dreapta jos
    if(lin>dim/2 && col>dim/2)
        {
            lin=lin-dim/2;
            col=col-dim/2;
            return 2*val+fractal(dim/2,lin,col);
        }
    ///stanga sus
    if(lin<=dim/2 && col<=dim/2)
        {
            swap(lin,col);
            return fractal(dim/2,lin,col);
        }
    ///dreapta sus
    lin=dim+1-lin;
    col=dim/2+1-col;
    return 3*val+fractal(dim/2,lin,col);
}

int main()
{
    int k,lin,col;
    fin>>k;
    fin>>col>>lin;
    int dim=(1<<k);
    fout<<fractal(dim,lin,col)-1;
    return 0;
}