The distance between the two teaching buildings of Zixing Primary School is 300 meters. The green team needs to plant pine trees on both sides of the path between the two buildings (not at both ends). The distance between two adjacent pine trees is 4 meters. How many trees should be planted in total? pine?
紫星小学的两幢教学楼相距300米，绿化队要在两楼之间的小路两旁栽松树(两端不栽)，相邻两棵松树之间的距离为4米，一共要栽多少棵松树？
<gadget id="calculator">300 / 4</gadget>
<output>75</output>

<gadget id="calculator">75 - 1</gadget>
<output>74</output>

<gadget id="calculator">74 * 2</gadget>
<output>148</output>

<result>148</result>