Teacher Wang, Teacher Liu, Teacher Yang, and Teacher Zhang use the same copier to copy materials. Teacher Wang takes 4 minutes, Teacher Liu takes 1 minute, Teacher Yang takes 3 minutes, and Teacher Zhang takes 2 minutes. How to arrange the order of the four people? Make them spend the least amount of time? What is the minimum time?
王老师、刘老师、杨老师和张老师四人用同一台复印机复印资料，王老师要4分钟，刘老师要1分钟，杨老师要3分钟，张老师要2分钟，怎样安排四个人的顺序使他们花的时间最少？最少时间是多少？
<gadget id="calculator">1 * 4</gadget>
<output>4</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<gadget id="calculator">4 + 6 + 6 + 4</gadget>
<output>20</output>

<result>20</result>