Plant trees on one side of a section of road. First, one tree is planted at the starting point, and then one tree is planted every 3 meters. A total of 234 trees are planted. How many meters is this road?
在一段公路的一边种树，先在起点种一棵，以后每隔3米种一棵，一共种了234棵．这段公路长多少米？
<gadget id="calculator">234 - 1</gadget>
<output>233</output>

<gadget id="calculator">233 * 3</gadget>
<output>699</output>

<result>699</result>