On Children's Day, the school put up colorful flags on the 100-meter-long school road, one every 5 meters, and both ends. How many colored flags were there in total?
六一儿童节学校在长100米的校道上插上彩旗，每隔5米插一面，两端都插，一共插了多少面彩旗．
<gadget id="calculator">100 / 5</gadget>
<output>20</output>

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

<result>21</result>