There are 20 identical bookshelves in the school. Each shelf has 3 floors. Each floor can hold 36 books. How many books can be placed in total?
学校有20一样的书架，每个书架有3层，每层可放书36本，一共可放书多少本？
<gadget id="calculator">36 * 3 * 20</gadget>
<output>2_160</output>

<result>2_160</result>