#include<iostream>
#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/=2;
    if(x<=k&&y<=k)
    return rez(k,y,x);
    else
    if(x<=k)
    {
        return k*k+rez(k,x,y-k);
    }
    else
    if(y<=k)
    {
        return k*k*3+rez(k,k-y+1,2*k-x+1);
    }
    else
    {
        return k*k*2+rez(k,x-k,y-k);
    }
}
int main()
{
    fin>>k>>x>>y;
    fout<<rez(1<<k,x,y);
    return 0;
}