On one side of a road, a tree is planted every 4 meters, and a total of 200 trees are planted. How many meters is the total length of this road?
在一条公路的一边，每隔4米栽一棵树，一共栽了200棵树，这条路全长有多少米？
<gadget id="calculator">200 - 1</gadget>
<output>199</output>

<gadget id="calculator">199 * 4</gadget>
<output>796</output>

<result>796</result>