There are 2,800 poplars in the forest farm, 1,500 more willows than poplars, and 120 fewer pine trees than willows. How many pine trees are there?
林场有2800棵杨树，柳树比杨树多1500棵，松树比柳树少120棵．松树有多少棵？
<gadget id="calculator">1_500 - 120</gadget>
<output>1_380</output>

<gadget id="calculator">2_800 + 1_380</gadget>
<output>4_180</output>

<result>4_180</result>