For the school’s New Year’s Day celebration, colorful flags are placed on both sides of the playground with a length of 28 meters, and a colorful flag is inserted every 4 meters (both ends). How many sides will be inserted in total?
学校庆元旦活动，在操场28米长的两边插彩旗，每隔4米插一面彩旗，(两头都插)，一共要插多少面？
<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>