There is a circular flower bed in the park with a diameter of 30 meters. Grandpa Zhang ran around the flower bed 5 times in the morning exercise. How many meters did he run this morning exercise?
公园里有一圆形花坛，直径30米，张爷爷晨练绕花坛跑5圈，他这次晨练跑了多少米？
<gadget id="calculator">3.14 * 30 * 5</gadget>
<output>471</output>

<result>471</result>