How many days will the Winter Olympic Games be held in Sochi from February 7th to February 23rd this year?
今年2月7日到2月23日在索契市举行的冬季奥运会共多少天．
<gadget id="calculator">23 - 7</gadget>
<output>16</output>

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

<result>17</result>