The school buys a batch of books and puts them in the library. Each bookshelf can hold 126 books, exactly 27 bookshelves. How many books did the school buy back in total?
学校买回一批图书放入图书室，每个书架可放126本书，正好放满27个书架．学校一共买回了多少本图书？
<gadget id="calculator">126 * 27</gadget>
<output>3_402</output>

<result>3_402</result>