Xiao Ming reads a storybook. He read 12 pages on the first day, 13 pages on the second day, and left 8 pages unread. How many pages does this storybook have?
小明看一本故事书，第一天看了12页，第二天看了13页，还剩下8页没有看．这本故事书有多少页．
<gadget id="calculator">12 + 13 + 8</gadget>
<output>33</output>

<result>33</result>