There are 5 bookshelves in the school library, and each shelf contains 830 books. How many books are there in the school library?
学校图书室有5个书架，每个书架有830本书，学校图书室一共有多少本图书？
<gadget id="calculator">830 * 5</gadget>
<output>4_150</output>

<result>4_150</result>