class Point
  {
    public double x;
    public double y;
 
    Point(double xval, double yval)
      { x = xval; y = yval; }

    public static double distance(Point a, Point b)
      {
        double dx = a.x - b.x, dy = a.y - b.y;
        return Math.sqrt(dx*dx + dy*dy);
      }

  }