Today is the holiday from June 30th to September 1st, how many days are you in summer vacation?
今天6月30日放假到9月1日开学，暑假放多少天．
<gadget id="calculator">31 + 31</gadget>
<output>62</output>

<gadget id="calculator">62 + 1</gadget>
<output>63</output>

<result>63</result>