using namespace std;
#include<iostream>
#include<fstream>

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

int k, y, x;

///1 4
///2 3

int ans(int k, int x, int y) {
    
    //cout << k << " " << x << " " << y << endl;
    if (k == 0) {
        return 0;
    }
    k--;
    int d = (1<<k);
    
    if (x <= d && y <= d) { ///cadranul 1
        int copiex = x;
        x = y;
        y = copiex;
        return ans(k, x, y); ///intorc figura la 90 grade in sens invers trigonometric
    }
    
    if (x > d && y <= d) { /// cadranul 2
       // cout << "adaug: " << d*d << endl;
        return d*d + ans(k, x-d, y); /// nu intorc figura, dar o translatez cu d pozitii in sus
    }
    
    if (x > d && y > d) { ///cadranul 3
        //cout << "adaug: " << 2*d*d << endl;
        return 2*d*d + ans(k, x-d, y-d); /// nu intorc figura, dar o translatez cu d pozitii in sus si d pozitii in stanga
    }
    
    if (x <= d && y > d) { ///cadranul 4
        int copiey = y;
        y = d - x + 1;
        x = 2*d - copiey+1;
    
       // cout << "adaug: " << 3*d*d << endl;
        return 3*d*d + ans(k, x, y); ///intorc figura la 90 grade in sens trigonometric
    }
}

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