There is a circular flower bed in the park with a circumference of 180 meters. Around the flower bed, plant a holly tree every 4 meters, how many trees can be planted in total.
公园里有个圆形花坛，周长180米．在花坛的四周，每隔4米种1棵冬青树，一共可以种多少棵．
<gadget id="calculator">180 / 4</gadget>
<output>45</output>

<result>45</result>