The swimming pool is 45 meters long. The Olympic champion Sun Yang swam 6 rounds in this swimming pool. How many meters did Sun Yang swim in total?
游泳池长45米，奥运会冠军孙杨在这个游泳池里游了6个来回，孙杨一共游了多少米．
<gadget id="calculator">45 * 2 * 6</gadget>
<output>540</output>

<result>540</result>