First, ask the clerk in the bookstore. If not, please see the second move.

Count how many there are in a row, then count the bookshelves in the bookstore and calculate according to the multiplication formula. Of course, toy cabinets don't count. It is not the last resort; The ultimate move!

Check the detailed information on the internet and estimate the number of books according to the information. If you are a poor person who has no money to surf the Internet, please look for the information profile of this library. The worst thing is to discuss with some good friends.

It's tiring to play by hand, please adopt it.