The students plant trees on one side of the 200-meter-long path, and carry one tree every 4 meters (both ends must be planted), how many saplings are needed in total.
同学们在长200米的小路一边植树，每隔4米载一棵(两端都要栽)，一共需要多少棵树苗．
<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<gadget id="calculator">50 + 1</gadget>
<output>51</output>

<result>51</result>