The summer vacation this year starts from June 30th and ends on August 31st. How many days are there in total?
今年暑假从6月30日开始，到8月31日结束，暑假一共有多少天．
<gadget id="calculator">31 + 31</gadget>
<output>62</output>

<gadget id="calculator">62 + 1</gadget>
<output>63</output>

<result>63</result>