<image>As shown in the image, points A and B have coordinates (1,4) and (4,4) respectively. The vertex of the parabola \(y = a(x - m)^2 + n\) moves along the line segment AB and intersects the x-axis at points C and D (with C to the left of D). If the minimum x-coordinate of point C is -3, then the maximum x-coordinate of point D is ___.
