The school held a knowledge contest of "reading good books and filling the campus with books", and a new batch of books were introduced. Among them, there are 820 science and technology books, the number of story books is (2/5) of the number of science and technology books, and the number of literature and art books is (7/8) of the number of story books. How many new literature and art books are there?
学校举行"读好书，书香满校园"知识竞赛活动，新进一批图书．其中，科技书820本，故事书的本数是科技书的(2/5)，文艺书是故事书本数的(7/8)．新进文艺书有多少本？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">820 * (2/5) * (7/8)</gadget>
<output>287</output>

<result>287</result>