#include <fstream>
using namespace std;
ifstream f("fractal.in");
ofstream g("fractal.out");

int k,x,y,aux,a;

int dei(int p)
{
    if(!p)
        return 0;
    a=(1<<(p-1));
    if(x<=a)
    {
        if(y<=a)
        {
            aux=x;
            x=y;
            y=a-aux+1;
            return a*a-dei(p-1)-1;
        }
        else
        {
            y-=a;
            aux=x;
            x=a-y+1;
            y=aux;
            return 4*a*a-dei(p-1)-1;
        }
    }
    else
    {
        if(y<=a)
        {
            x-=a;
            return a*a+dei(p-1);
        }
        else
        {
            x-=a;
            y-=a;
            return 2*a*a+dei(p-1);
        }
    }
}

int main()
{
    f>>k>>y>>x;
    g<<dei(k)<<'\n';
    f.close();
    g.close();
    return 0;
}