There are 243 pine trees, 26 fewer willow trees than pine trees, and three times as many poplar trees as willow trees. How many poplar trees are there?
松树243棵，柳树比松树少26棵，杨树是柳树的3倍，杨树有多少棵？
<gadget id="calculator">243 + 26</gadget>
<output>269</output>

<gadget id="calculator">269 * 2</gadget>
<output>538</output>

<result>538</result>