The stadium is 96 meters long. Originally, a red flag was inserted every 4 meters (both ends must be inserted), but now it is changed to a red flag every 6 meters. How many red flags do not need to be pulled out?
运动场全长96米，原来每隔4米插一面红旗(两端都要插)，现在要改成每隔6米插一面红旗，那么有多少面红旗不必拔出来？
<gadget id="calculator">96 / 12</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<result>9</result>