Summer vacation is coming soon. If students start to rest from July 1st and report to school on August 30th, how many days have you rested this summer vacation?
马上就要放暑假了，假如同学们从7月1日开始休息，8月30日到学校报到，这个暑假你一共休息了多少天．
<gadget id="calculator">30 - 1</gadget>
<output>29</output>

<gadget id="calculator">31 + 29</gadget>
<output>60</output>

<result>60</result>