Do the math, the 2014 summer vacation starts on June 28 and ends on August 29. How many days are you off in total?
算一算，2014年暑假从6月28日开始，到8月29日结束．一共放假多少天？
<gadget id="calculator">30 - 28</gadget>
<output>2</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">3 + 31 + 29</gadget>
<output>63</output>

<result>63</result>