Elementary school starts summer vacation on July 6th, and attends school on September 1st. How many days are there in summer vacation?
小学7月6日暑假开始，9月1日到校上课，暑假共有多少天．
<gadget id="calculator">31 - 6</gadget>
<output>25</output>

<gadget id="calculator">25 + 1</gadget>
<output>26</output>

<gadget id="calculator">31 + 26</gadget>
<output>57</output>

<result>57</result>