The summer vacation is from July 2nd to August 31st, how many days are there in total?
放暑假从7月2日到8月31日，共放假多少天．
<gadget id="calculator">31 - 2</gadget>
<output>29</output>

<gadget id="calculator">29 + 1</gadget>
<output>30</output>

<gadget id="calculator">30 + 31</gadget>
<output>61</output>

<result>61</result>