Install street lamps on both sides of a 3,000-meter-long highway (both ends must be installed), and the distance between each adjacent two is 200 meters. How many street lamps need to be installed in total?
在一段长3000米的公路两旁安装路灯(两端要安装)，每相邻两根的距离是200米，一共需要安装多少盏路灯？
<gadget id="calculator">3_000 / 200</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<result>32</result>