The school bought 5 bookshelves, each with 4 layers, and each layer can hold 26 books. How many books can these bookshelves hold in total?
学校买来5个书架，每个书架有4层，每层可以放26本书，这些书架一共可以放书多少本？
<gadget id="calculator">26 * 5 * 4</gadget>
<output>520</output>

<result>520</result>