Guangming Primary School will be on holiday from July 15th to August 29th. How many days will there be?
光明小学从7月15日开始放假，到8月29日开学，共放假多少天？
<gadget id="calculator">31 - 15</gadget>
<output>16</output>

<gadget id="calculator">29 - 1</gadget>
<output>28</output>

<gadget id="calculator">16 + 1 + 28</gadget>
<output>45</output>

<result>45</result>