The municipal square is a rectangle with a length of 300m and a width of 200m. A colorful flag is inserted every 5m around it. How many colored flags are needed in total? (insert one side on each of the four corners)
市政广场是一个长300m，宽200m的长方形，在它的四周每隔5m插一面彩旗，一共需要多少面彩旗？(四个角上各插一面)
<gadget id="calculator">300 + 200</gadget>
<output>500</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">500 * (2/5)</gadget>
<output>200</output>

<result>200</result>