The students have summer vacation on July 6th and go to school on September 1st. How many days are there in the summer vacation?
同学们7月6日放暑假，9月1日到校上课，暑假共多少天．
<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>