Uncle Zhou made up a 62.8-meter-long fence to surround chickens. What is the largest area he fenced?
周大爷编了一张长62.8米的篱笆来围鸡，他围的最大面积是多少．
<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>