A, B, C, and D each have a wheat field. They use a harvester to harvest at the same time. A’s wheat field needs 4 hours to harvest, B’s wheat field needs 1 hour to harvest, C’s wheat field needs 3 hours to harvest, and D’s wheat field needs 3 hours to harvest. It takes 2 hours to harvest the wheat field. How to arrange the order of the four people so that the total time they spend is the least? What is the minimum time?
甲、乙、丙、丁四人各有一块麦田，他们同时用一台收割机进行收割，甲的麦田收割需要4小时，乙的麦田收割需要1小时，丙的麦田收割需要3小时，丁的麦田收割需要2小时，怎样合理安排四人的顺序才能达到他们花的总时间最少？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 + 6 + 6 + 4</gadget>
<output>20</output>

<result>20</result>