Uncle Li delivered an average of 27 express mails every working day. If calculated on the basis of 22 working days per month, how many express mails will Uncle Li deliver in half a year?
李叔叔平均每个工作日投送27个快递邮件．如果每月按22个工作日计算，李叔叔半年一共投送多少个快递邮件？
<gadget id="calculator">27 * 22 * 6</gadget>
<output>3_564</output>

<result>3_564</result>