Xinxing Farm planted 216 pine trees in the year before last. In order to increase the area of tree planting, the number of pine trees planted last year was 3 times that of the previous year, and this year is 15 times that of last year. How many pine trees were planted in Xinxing Farm this year?
新兴农场前年种了216棵松树，为了加大植树面积，去年种的松树是前年的3倍，今年种的是去年的15倍，新兴农场今年种了多少棵松树？
<gadget id="calculator">216 * 3 * 15</gadget>
<output>9_720</output>

<result>9_720</result>