Three children line up to make calls. Xiao Ming needs to make calls for 4 minutes, Xiao Hong needs to make calls for 5 minutes, and Xiao Li needs to make calls for 3 minutes. To minimize the total waiting time of the three, how should the order of calling be arranged? What is the minimum total waiting time in minutes?
三个小朋友排队打电话，小明要打4分钟，小红要打5分钟，小丽要打3分钟，要使三人等候时间总和最少，应该怎样安排打电话的顺序？最少等候的时间总和是多少分钟？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">9 + 8 + 5</gadget>
<output>22</output>

<result>22</result>