Zhang Li runs around the playground which is 300 meters long and 100 meters wide. How many meters did she run?
张莉沿着长300米，宽100米的操场跑一圈，她跑了多少米米．
<gadget id="calculator">300 + 100</gadget>
<output>400</output>

<gadget id="calculator">400 * 2</gadget>
<output>800</output>

<result>800</result>