Grandpa does exercise and insists on running 3 laps every day. Each lap of the track is 400 meters long. How many meters does grandpa run in a week?
爷爷锻炼身体，每天坚持跑3圈，跑道每圈长400米，爷爷一星期跑了多少米？
<gadget id="calculator">400 * 3 * 7</gadget>
<output>8_400</output>

<result>8_400</result>