A comic book has 40 pages. I read 5 pages on the first day and 8 pages on the second day. How many pages should I read on the third day?
一本漫画书有40页，第一天看了5页，第二天有看了8页，第三天应从第多少页看起．
<gadget id="calculator">5 + 8 + 1</gadget>
<output>14</output>

<result>14</result>