There is a book that Ding Ding reads 40 pages a day for 8 days, and there are 58 pages left. How many pages does this book have?
有一本书，丁丁每天看40页，看了8天，还剩58页，这本书一共有几页？
<gadget id="calculator">40 * 8</gadget>
<output>320</output>

<gadget id="calculator">320 + 58</gadget>
<output>378</output>

<result>378</result>