2009 Winter Holiday Experimental Primary School is closed from January 29th to March 1st. How many days are there in total?
2009年寒假实验小学从1月29日放假至3月1日开学，共放假多少天．
<gadget id="calculator">31 - 29</gadget>
<output>2</output>

<gadget id="calculator">2 + 1 + 28</gadget>
<output>31</output>

<result>31</result>