Each bookshelf has 4 layers, and each layer can hold 16 books. There are 18 such bookshelves in the school library, how many books can be placed in total?
每个书架有4层，每层可以放16本书．学校图书馆有18个这样的书架，一共可以放多少本书？
<gadget id="calculator">4 * 16 * 18</gadget>
<output>1_152</output>

<result>1_152</result>