The distance between the two buildings is 24m, and there is a cement road in the middle. Now, trees are to be planted on both sides of this road, every 3m (both ends are not parallel), how many trees will be planted in total?
两栋楼前后相隔24m，中间有一条水泥路，现在要在这条路的两边种树，每隔3m种一棵(两端都不平行)，一共要种多少棵树？
<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<result>14</result>