There is a 600-meter-long path in the school. Trees are to be planted on both sides of the path, with one tree every 4 meters. If trees are planted at both ends, how many trees will be planted in total?
学校有一条长600米的小路，准备在小路的两旁栽树，每隔4米栽一棵，如果两端都栽树，共需要栽多少棵树？
<gadget id="calculator">600 / 4</gadget>
<output>150</output>

<gadget id="calculator">150 + 1</gadget>
<output>151</output>

<gadget id="calculator">151 * 2</gadget>
<output>302</output>

<result>302</result>