There is a 200m path in the school. Trees are to be planted on both sides of the path, with one tree every 4m. If trees are planted at both ends, how many saplings should be planted in total?
学校有一条200m的小路，准备在小路的两旁栽树，每隔4m栽一棵，如果两端都栽树，那么共需栽多少棵树苗？
<gadget id="calculator">200 / 4</gadget>
<output>50</output>

<gadget id="calculator">50 + 1</gadget>
<output>51</output>

<gadget id="calculator">51 * 2</gadget>
<output>102</output>

<result>102</result>