A school starts summer vacation on July 4th and starts on September 1st. How many days are there in total?
某学校从7月4日开始放暑假，9月1日开学，一共放假多少天．
<gadget id="calculator">31 + 1</gadget>
<output>32</output>

<gadget id="calculator">32 - 2</gadget>
<output>30</output>

<gadget id="calculator">28 + 30</gadget>
<output>58</output>

<result>58</result>