Trees are planted on one side of the road, and trees are planted at both ends. The length is 100 meters, and the distance between two adjacent trees is 5 meters. How many trees are there in total?
马路的一侧种树，且两端都种树，长100米，且相邻两棵树之间的距离是5米，那么共有几棵树？
<gadget id="calculator">100 / 5</gadget>
<output>20</output>

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

<result>21</result>