The 18th FIFA World Cup started in Germany on June 9, 2006 and ended on July 10. How many days did it last?
第十八届世界杯足球赛于06年6月9日在德国开始，7月10日结束，前后一共持续多少天．
<gadget id="calculator">30 - 9</gadget>
<output>21</output>

<gadget id="calculator">21 + 1 + 10</gadget>
<output>32</output>

<result>32</result>