Street lamps are installed on both sides of a street with a total length of 2000 meters (both ends are installed), and one is installed every 50 meters. How many street lamps are installed in total?
全长2000米的街道两旁安装路灯(两端都装)，每隔50米装一座，一共安装多少座路灯？
<gadget id="calculator">2_000 / 50</gadget>
<output>40</output>

<gadget id="calculator">40 + 1</gadget>
<output>41</output>

<gadget id="calculator">41 * 2</gadget>
<output>82</output>

<result>82</result>