There are 8 colored flags on the right side of the school gate, and the distance between every two colored flags is 2 meters. How many meters are there between the first colored flag and the eighth colored flag?
学校校门的右边插了8面彩旗，每两面彩旗之间的距离都是2米，从第1面彩旗到第8面彩旗之间共有多少米．
<gadget id="calculator">8 - 1</gadget>
<output>7</output>

<gadget id="calculator">2 * 7</gadget>
<output>14</output>

<result>14</result>