Grandma Li used one of her yard walls to form a chicken coop with a fence. The chicken coop is 20 meters long and 16 meters wide. How long is the fence at least?
李奶奶利用自家的一面院墙，用篱笆围成一个鸡舍，鸡舍长是20米，宽是16米，这圈篱笆至少长多少米？
<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<gadget id="calculator">20 + 32</gadget>
<output>52</output>

<result>52</result>