#include <fstream>
using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");
int k,x,y;

int rez(int k, int x, int y)
{
    if (k==1) return 0;
    k=k/2;
    if (x<=k && y<=k)///cadranul 1
        return  rez(k,y,x);
    if (x<=k && y>=k)///cadranul 2
        return  k*k + rez(k,x,y-k);
    if (x>=k && y<=k)///cadranul 4
        return  k*k*3 + rez(k,k-y+1,2*k-x+1);
    if (x>=k && y>=k)///cadranul 3
        return  k*k*2 + rez(k,x-k,y-k);//
}


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