A science book, I read 35 pages a day, and after reading for a week, there are 320 pages left, how many pages does this story book have?
一本科技书，明明每天看35页，看了一个星期后还剩320页没有看，这本故事书共有多少页？
<gadget id="calculator">35 * 7</gadget>
<output>245</output>

<gadget id="calculator">245 + 320</gadget>
<output>565</output>

<result>565</result>