A rectangular playground is 300 meters long and 100 meters wide. Xiao Ming runs around the playground twice a day. How many meters does he run every day?
长方形操场，长为300米宽为100米，小明每天绕操场跑两圈，他每天跑了多少米？
<gadget id="calculator">300 + 100</gadget>
<output>400</output>

<gadget id="calculator">400 * 2 * 2</gadget>
<output>1_600</output>

<result>1_600</result>