A rectangular sports field is 250 meters long and 200 meters wide. During morning exercises, the third graders ran around the playground twice. How many meters did the students run?
一个长方形运动场，长250米，宽200米，早操时三年级同学绕操场跑了两圈，同学们跑了多少米？
<gadget id="calculator">250 + 200</gadget>
<output>450</output>

<gadget id="calculator">450 * 2 * 2</gadget>
<output>1_800</output>

<result>1_800</result>