There are 9 novel books, 4 drama books, 12 poetry books and 7 grammar books in my bookshelf. The books are randomly arranged in the shelf and not at all in the order of their type. My reading room where that bookshelf is located lacks sufficient lighting during evening time and as a result of that, types of that bookshelf are not visible, what is the least number of books that must be drawn from the bookshelf in the evening in order to get 6 books of a particular type?