The football field of Renmin Road Primary School is a rectangle with a length of 100 meters and a width of 50 meters. How many meters does it take for Xiao Ming to run a lap?
人民路小学足球场是个长方形，长是100米，宽是50米，小明跑一圈是多少米？
<gadget id="calculator">100 + 50</gadget>
<output>150</output>

<gadget id="calculator">150 * 2</gadget>
<output>300</output>

<result>300</result>