There is a 45-meter-long runway on the sports field, and two colored flags have been inserted at both ends. The physical education teacher requires that another colored flag be inserted every 5 meters on this runway. How many colored flags are needed?
运动场上有一条长45米的跑道，两端已插了二面彩旗，体育老师要求在这条跑道上每隔5米再插一面彩旗，还需要彩旗多少面．
<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<result>8</result>