How many days did the 2008 Beijing Olympic Games last from the opening on August 8 to the closing on August 24?
2008北京奥运会从8月8日开幕到8月24日闭幕，共历时多少天．
<gadget id="calculator">24 - 8</gadget>
<output>16</output>

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

<result>17</result>