The 29th Olympic Games will open in Beijing on August 8, 2008 and close on August 24. How many days have passed from the opening to the closing?
第29届奥运会将于2008年8月8日在北京开幕，在8月24日闭幕，从开幕到闭幕共经历多少天．
<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<gadget id="calculator">16 + 1</gadget>
<output>17</output>

<result>17</result>