Plant trees on both sides of the road between two buildings 50 meters apart, and plant one tree every 5 meters. How many trees should be planted in total?
在相距50米的两幢楼之间的道路两旁种树，每隔5米种一棵，一共要种多少棵？
<gadget id="calculator">50 / 5</gadget>
<output>10</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<result>9</result>