The summer vacation is on June 25 every year, and the school officially starts on September 1. How many days are there in this summer vacation?
每年6月25日放暑假，9月1日正式开学，这个暑假共有多少天．
<gadget id="calculator">6 + 31 + 31</gadget>
<output>68</output>

<result>68</result>