A project started on February 25, 2012 and was completed on March 6 (including the day of completion). How many days did the project last?
一项工程2012年2月25日开工，到3月6日完工(包括完工的这一天)．这项工程一共干了多少天．
<gadget id="calculator">29 - 25</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<result>11</result>