The campus avenue is 30 meters long. Now trees are planted on one side of the avenue, with one tree every 5 meters. Neither end of the avenue is planted. How many trees will be planted in total?
校园大道共30米长，现在大道的一侧栽树，每隔5米栽1棵，路的两端都不栽，一共要栽几棵树？
<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<result>5</result>