Xiaohong reads a 200-page book. She reads page 15 on the first day and page 18 on the second day. How many pages should she start reading on the third day?
小红看一本200页的书，第一天看了15页，第二天看了18页，第三天应从第多少页开始看．
<gadget id="calculator">15 + 18 + 1</gadget>
<output>34</output>

<result>34</result>