Dengta Primary School has a rectangular playground with a length of 150 meters and a width of 50 meters. How many meters is it to run two laps along the edge of the playground?
灯塔小学有一个长方形操场，长150米，宽50米，沿操场边沿跑两圈是多少米．
<gadget id="calculator">150 + 50</gadget>
<output>200</output>

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

<result>800</result>