class Point {
    int x;
    int y;

    Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public boolean equals(Object o) {
      if (o instanceof Point) {
        if (!o.getClass().isAssignableFrom(getClass())) {
          //let the subclass decide if we are equal
          return o.equals(this);
        }
        Point p = (Point)o;
        return x == p.x && y == p.y;
      }
      return false;
    }

    public int hashCode() {
      return x*31 + y*29;
    }
    public String toString() {
        return ("Point: x = " + x + ", y = " + y);
    }
}