On the eve of June 1st, the school planted colorful flags on both sides of a 69-meter-long road, one every 3 meters. How many flags will be planted from start to finish?
六一前夕，学校在一条长69米的道路两侧插彩旗，每隔3米插一根．从头到尾一共要要插多少根彩旗？
<gadget id="calculator">69 / 3</gadget>
<output>23</output>

<gadget id="calculator">23 + 1</gadget>
<output>24</output>

<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<result>48</result>