Plant a row of trees on one side of a 180-meter-long boulevard at the gate of the school, with both the starting point and the ending point. If every two trees are separated by 3 meters, at least how many saplings are needed?
在学校门口一条长180米的林荫路的一侧栽一行树，起点和终点都栽．如果每两棵树之间相隔3米，至少需要多少棵树苗？
<gadget id="calculator">180 / 3</gadget>
<output>60</output>

<gadget id="calculator">60 + 1</gadget>
<output>61</output>

<result>61</result>