Last year, the summer vacation of primary and secondary schools in Nanjing started on July 4th and ended on August 31st. How many days are there in total?
去年南京市中、小学的暑假从7月4日开始，到8月31日结束，暑假一共有多少天．
<gadget id="calculator">28 + 31</gadget>
<output>59</output>

<result>59</result>