There are 9 bookshelves in the library, each shelf has 4 floors, and each floor contains 208 books. How many books are there in the library?
图书室有9个书架，每个书架有4层，每层有208本书，图书室一共有多少书？
<gadget id="calculator">208 * 4 * 9</gadget>
<output>7_488</output>

<result>7_488</result>