The school starts summer vacation on July 2nd and starts school on September 1st. How long is the summer vacation?
学校从7月2日开始放暑假，9月1日上学，暑假多长时间？
<gadget id="calculator">31 - 2</gadget>
<output>29</output>

<gadget id="calculator">29 + 1 + 31</gadget>
<output>61</output>

<result>61</result>