A rectangular piece of land is 8 meters long and 6 meters wide, one side is against the wall, and now it is surrounded by fences on three sides. How many meters should it be at least?
一块长方形的地，一面靠墙，长8米，宽6米，现在三面围上篱笆，至少要用多少米？
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 + 8</gadget>
<output>20</output>

<result>20</result>