The distance between A and B is 4 kilometers, and there is a stop sign every 800 meters (one for each of A and B). How many stop signs are there in A and B?
甲、乙两地相距4千米，每隔800米设一个站牌(甲、乙两地各设一个)．甲、乙两地一共设有多少站牌．
<gadget id="calculator">4 * 1_000</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 / 800</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>