There are 958 books in the school library, 485 books are lent out in the morning, and 218 books are returned in the afternoon. How many books are there in the library now?
学校图书室有图书958本，上午借出485本，下午还回218本，现在图书室有图书多少本？
<gadget id="calculator">958 - 485</gadget>
<output>473</output>

<gadget id="calculator">473 + 218</gadget>
<output>691</output>

<result>691</result>