A forest farm planted 1,480 trees in the year before last, and the number of trees planted last year was twice that of the year before. How many trees are you planting this year?
一个林场前年植树1480棵，去年植树的棵数是前年的2倍，今年植树比前两年植树的总数还多420棵．今年植树多少棵？
<gadget id="calculator">1_480 * 2</gadget>
<output>2_960</output>

<gadget id="calculator">2_960 + 1_480 + 420</gadget>
<output>4_860</output>

<result>4_860</result>