There are 4 bookshelves in the library, each shelf has 4 floors, and each floor can hold 35 books. How many books can be placed in total?
图书室有4个书架，每个书架有4层，每层可放35本书，一共可放多少本书？
<gadget id="calculator">35 * 4 * 4</gadget>
<output>560</output>

<result>560</result>