#include <fstream>

using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");

int n,k,x,y,i,l;

int solve(){
    int nr=0;
    while(x>1 || y>1){
        l/=2;
        if(x<=l && y<=l){ //CADRAN I
            swap(x,y);
        }
        else if(x>l && y<=l){ //CADRAN II
            nr+=l*l;
            x-=l;
        }
        else if(x>l && y>l){ //CADRAN III
            nr+=2*l*l;
            x-=l;
            y-=l;
        }
        else{ //CADRAN IV
            nr+=3*l*l;
            y-=l;
            y=l-y+1;
            x=l-x+1;
            swap(x,y);
        }
    }
    return nr;
}

int main()
{
    fin>>k>>y>>x;
    l=(1<<k);
    int sol=solve();
    fout<<sol;
    return 0;
}