The distance between two residential buildings is 65 meters. The environmental protection team should plant trees beside the path between the two buildings. The distance between each two trees is 5 meters (the trees at both ends are 5 meters away from the residential buildings). How many trees should be planted in total?
两栋居民楼相距65米，环保小分队要在两楼间的小路旁种树，每两棵相隔5米(两端的树离居民楼为5米)，一共要种多少棵数．
<gadget id="calculator">65 / 5</gadget>
<output>13</output>

<gadget id="calculator">13 - 1</gadget>
<output>12</output>

<result>12</result>