Counting from the 15th tree to the 46th tree, how many trees are there in total?
从第15棵树数到46棵树，一共有多少棵树？
<gadget id="calculator">46 - 15</gadget>
<output>31</output>

<gadget id="calculator">31 + 1</gadget>
<output>32</output>

<result>32</result>