One lap of the playground is 400 meters. Xiaohong runs two laps every day. How many meters has she run in 5 days?
操场一圈400米，小红每天跑两圈，5天跑了多少米．
<gadget id="calculator">400 * 2 * 5</gadget>
<output>4_000</output>

<result>4_000</result>