The school bought 6 bookshelves, each with 4 layers, and each layer can hold 36 books. How many books can these bookshelves hold in total?
学校买来6个书架，每个书架有4层，每层可以放36本书，这些书架一共可以放多少本书？
<gadget id="calculator">36 * 4 * 6</gadget>
<output>864</output>

<result>864</result>