Use a fence to form a chicken house with a length of 8 meters and a width of 4 meters. In order to save materials, how many meters of fence should be used for one side of the wall?
用篱笆围成一个长8米，宽4米的鸡舍，为了节省材料，一面靠墙至少要用多少米的篱笆？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 8</gadget>
<output>16</output>

<result>16</result>