There is a road 100 meters long, and a tree is planted every 5 meters from the beginning to the end on one side of the road. How many trees can be planted in total?
有一条路长100米，在路的一侧从头到尾每隔5米栽一棵树．一共可以栽多少棵树？
<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<result>21</result>