Study the following information carefully and answer the given questions: Eight persons—A, B, C, D, E, F, G, and H—purchased different items—Lamp, Cal...

Study the following information carefully and answer the given questions: Eight persons—A, B, C, D, E, F, G, and H—purchased different items—Lamp, Calculator, Pen, Pencil, Book, Watch, Bag and Laptop—one after the other. However, not necessarily in the same order. A purchased an item immediately after C. Three persons purchased items between C and the one who purchased Pen. Two persons purchased items between the one who purchased pen and the one who purchased calculator. G purchased an item immediately before the person who purchased calculator. As many persons purchased before the one who purchased calculator as after the one who purchased watch. G doesn’t purchase watch. H purchased Laptop immediately before E and immediately after D. Two persons purchased between D and the one who purchased Bag. G doesn’t purchase Lamp. B purchased the item before F. G and D doesn’t purchase book.
Question: How many persons purchased items after the one who purchased the Lamp?