Last year, the summer vacation of primary and secondary schools in Beijing started on July 8 and ended on August 31. How many days are there in total?
去年北京中、小学的暑假从7月8日开始，到8月31日结束，暑假一共有多少天．
<gadget id="calculator">31 - 8</gadget>
<output>23</output>

<gadget id="calculator">23 + 1 + 31</gadget>
<output>55</output>

<result>55</result>