In order to create a green primary school, the school planted 58 Metasequoia trees on both sides of the path between the teaching building and the library. The distance between two adjacent trees is 3 meters, and the distance between the two ends of the road is also 3 meters. How many meters is the path between the teaching building and the library?
为了创建绿色小学，学校在教学楼和图书馆间的小路两旁栽了58棵水杉树，相邻两棵树间的距离是3米，路两端距楼也是3米．教学楼和图书馆之间的小路长多少米？
<gadget id="calculator">58 / 2</gadget>
<output>29</output>

<gadget id="calculator">29 + 1</gadget>
<output>30</output>

<gadget id="calculator">3 * 30</gadget>
<output>90</output>

<result>90</result>