The school will be on holiday from July 4th to September 1st. How many days are there in total?
学校从7月4日放假，到9月1日开学，一共放假多少天．
<gadget id="calculator">31 - 4</gadget>
<output>27</output>

<gadget id="calculator">27 + 1</gadget>
<output>28</output>

<gadget id="calculator">31 + 1</gadget>
<output>32</output>

<gadget id="calculator">32 - 1</gadget>
<output>31</output>

<gadget id="calculator">28 + 31</gadget>
<output>59</output>

<result>59</result>