#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");

int k,x,y;

int fractal(int k, int x, int y)
    {
        if(k==1)
            return 0;
        k/=2;
        if(x<=k&&y<=k)
            return fractal(k,y,x);
        else
            if(x<=k)
                return k*k+fractal(k,x,y-k);
             else
                    if(y<=k)
                        return k*k*3+fractal(k,k-y+1,2*k-x+1);
                    else
                            return k*k*2+fractal(k,x-k,y-k);

    }

int main()
{
    fin>>k>>x>>y;
    fout<<fractal(1<<k,x,y);
    return 0;
}