There are 17 bookshelves in a library, each shelf has 3 floors, and 40 books are placed on each floor, how many books can be placed in total?
一个图书室有17个书架，每个书架有3层，每层放40本书，一共能放多少本书？
<gadget id="calculator">40 * 3 * 17</gadget>
<output>2_040</output>

<result>2_040</result>