There are 36 metasequoia trees on campus, and the number of pine trees is three times that of metasequoia trees. How many fewer metasequoia trees are there than pine trees?
校园里有水杉树36棵，松树的棵数是水杉树的3倍，水杉树比松树少多少棵？
<gadget id="calculator">36 * 3</gadget>
<output>108</output>

<gadget id="calculator">108 - 36</gadget>
<output>72</output>

<result>72</result>