The summer vacation begins on July 3, and school starts on September 1. How many days are there in summer vacation?
7月3日开始放暑假，到9月1日开学．暑假一共有多少天．
<gadget id="calculator">31 - 3</gadget>
<output>28</output>

<gadget id="calculator">28 + 1 + 31</gadget>
<output>60</output>

<result>60</result>