A column is 28 meters long from the first person to the last person, and the distance between the two people is 2 meters. How many people are there in this column?
一路纵队，从第一人到最后一人共长28米，前后两人都是间隔2米．这路纵队共有多少人？
<gadget id="calculator">28 / 2</gadget>
<output>14</output>

<gadget id="calculator">14 + 1</gadget>
<output>15</output>

<result>15</result>