The school's rectangular playground is 160 meters long and 40 meters wide. How many meters is it to run two laps along the edge of the playground?
学校长方形的操场长160米，宽40米，沿操场边沿跑两圈是多少米．
<gadget id="calculator">160 + 40</gadget>
<output>200</output>

<gadget id="calculator">200 * 2 * 2</gadget>
<output>800</output>

<result>800</result>