On one side of the 200-meter-long road, randomly plant some small trees. If the distance between two small trees does not exceed 4 meters, how many trees can be planted at least?
在200米长的道路一侧，随意种上一些小树，如果2棵小树间的距离不超过4米，那么最少能种多少棵．
<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<gadget id="calculator">50 - 1</gadget>
<output>49</output>

<result>49</result>