There is a road with a length of 1600 meters, and a street lamp is installed every 20 meters from the beginning to the end of the road. How many street lamps should be prepared in total?
有一条长1600米的公路，在公路一侧从头到尾每隔20米安装一盏路灯，一共要准备多少盏路灯？
<gadget id="calculator">1_600 / 20</gadget>
<output>80</output>

<gadget id="calculator">80 + 1</gadget>
<output>81</output>

<result>81</result>