Wang Hong participated in the swimming competition, and swam two rounds in the 50-meter-long swimming lane. Do you know how many meters of swimming competition Wang Hong participated in?
王红参加游泳比赛，在50米长的泳道上游了2个来回，你知道王红参加的多少米的游泳比赛吗？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">50 * 4</gadget>
<output>200</output>

<result>200</result>