Two painters have to paint the front and back of 7 identical boards. It takes 2 minutes per side, how to arrange the least time for painting? What is the minimum time in minutes?
两个油漆工要给7块同样的木板的正反面刷漆．每面需要2分钟，怎样安排刷漆的时间最少？最少的时间是多少分钟？
<gadget id="calculator">4 + 4 + 2 + 2 + 2</gadget>
<output>14</output>

<result>14</result>