Three children, Xiaoyu, Xiaoli, and Xiaofang lined up to go upstairs one by one. How many different ways are there in total?
小雨、小丽、小芳3个小朋友依次排队上楼，一共有多少种不同的排法．
<gadget id="calculator">3 * 2 * 1</gadget>
<output>6</output>

<result>6</result>