There are 4 bookshelves in the school book corner, each shelf has 5 floors, and each floor has 40 books. How many books are there in the book corner?
学校图书角有4个书架，每个书架有5层，每层有40本．图书角一共有多少本图书？
<gadget id="calculator">40 * 5 * 4</gadget>
<output>800</output>

<result>800</result>