struct Planet{
    int number;
    int x, y, z;
    int distance(const Planet& p){
        return min(abs(x - p.x), min(abs(y - p.y), abs(z - p.z)));
    }
    Planet(int n, int a, int b, int c) : number(n), x(a), y(b), z(c) {}
};

bool compareByX(const Planet& p1, const Planet& p2){
    return p1.x < p2.x;
}