146
You speak your answer and instantly the lid of the box clicks open.6 Congratulations, Grand Master Lone Wolf, your reckoning was correct. Dividing any number by one half actually doubles that number. Therefore, 80 divided by one half becomes 160. Subtract 14 from 160 and you have the solution to the puzzle.
Inside the box you discover a Map of Mogaruith, which details its dungeon levels. This is a Special Item which you carry tucked into your tunic. You need not discard any other Special Item in its favour if you already carry the maximum allowed.
An unexpected shuffling noise, somewhere in another part of the library, causes you to freeze. Someone else has entered. You look over your shoulder at the door and decide that now would be a very wise time to leave.