#include <fstream>
using namespace std;
int k, x, y, l, nr;

int main () {
    ifstream fin ("fractal.in");
    ofstream fout ("fractal.out");
    fin>>k>>y>>x;
    l=1<<k;
    nr=0;
    while (x>1 || y>1) {
        l/=2;
        if (x>l && y<=l) {
            nr+=l*l;
            x-=l;
        } else if (x>l && y>l) {
            nr+=2*l*l;
            x-=l;
            y-=l;
        } else if (x<=l && y>l) {
            nr+=3*l*l;
            y-=l;
        }
    }
    fout<<nr;
    return 0;
}