General Studies · Linear Arrangement

Six boxes, C, D, E, F, G, and H, are kept one above another. The topmost position is the first and the bottom-most position is the last. Three boxes are between D and C, where D is placed at the second-to-last position (5th position). Four boxes are kept between C and G. One box is kept between D and E. Box F is above H. How many boxes are between F and D?