On both sides of a 330-meter-long straight road, a colorful flag is inserted every 3 meters. If only one end is inserted, how many colored flags are needed in total?
一条330米长的直道两旁，每隔3米插一面彩旗，如果只插一端，一共需要多少面彩旗？
<gadget id="calculator">330 / 3</gadget>
<output>110</output>

<gadget id="calculator">110 * 2</gadget>
<output>220</output>

<result>220</result>