>> The correct answer is "buy more books." Duh. The correct number of books to own is always n+x where n = the number of books you own today, and x = an integer

>> The correct answer is "buy more books." Duh. The correct number of books to own is always n+x where n = the number of books you own today, and x = an integer > 0. > Well, you might also want to buy another bookshelf at some point, but otherwise I don't see the flaw in the logic. Simply move all the existing books along the shelf by one space. Then insert the new book in the new space. To add lots of new books, move all the existing books from space n to space n*2 and insert the new books in the new spaces.