On one side of a 72-meter-long road, trees are planted every 8 meters (both ends are planted), and now one tree is planted every 6 meters. How many trees do not need to be transplanted?
在一条长72米的大路一边每隔8米栽树(首尾都栽)，现在改为每隔6米栽一棵，那么不需要移栽的树有多少棵？
<gadget id="calculator">2 * 2 * 2 * 3</gadget>
<output>24</output>

<gadget id="calculator">72 / 24</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<result>4</result>