The school arranged the sports meeting venue, and put colorful flags on the side of the path. The distance between every two flags was originally set to be 3 meters, but later changed to 5 meters due to insufficient number of colored flags. If a flag at the starting point does not move, there will be another colorful flag at least how many meters away.
学校布置运动会会场，在小路的一旁插彩旗，原定每两面旗之间的距离为3米，后来由于彩旗数量不够，改为5米．如果起点的一面旗不移动，至少再隔多少米又有一面彩旗不需要移动．
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>