A road is 100 meters long, and a colorful flag is planted every 5 meters from the beginning to the end of the road. How many colored flags should be planted in total?
一条路长100米，在这条路的一旁从头到尾每隔5米插一面彩旗，一共要插多少面彩旗？
<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<gadget id="calculator">20 + 1</gadget>
<output>21</output>

<result>21</result>