Plant trees on one side of a road, first plant one tree at one end, and then plant one tree every 4 meters. After planting a total of 532 trees, they will be planted at the other end. How long is this road in meters?
在一条公路的一边种树，先在一头种一棵，以后每隔4米种一棵，一共种了532棵就种到另一头了，这条路长多少米．
<gadget id="calculator">532 - 1</gadget>
<output>531</output>

<gadget id="calculator">531 * 4</gadget>
<output>2_124</output>

<result>2_124</result>