Lele reads a book, 18 pages a day, 15 days, and 8 pages left. How many pages are there in this book?
乐乐看一本书，一天看18页，看了15天，还剩8页，这本书一共有多少页．
<gadget id="calculator">18 * 15</gadget>
<output>270</output>

<gadget id="calculator">270 + 8</gadget>
<output>278</output>

<result>278</result>