In order to beautify the city, Yongzhou put up colorful flags on the side of the road, every 4 meters, and a total of 25 flags were planted from the first flag to the last flag. Later, it was changed to insert a flag every 6 meters, and how many flags there are in total do not need to be moved.
永州市为美化城市，在公路一旁插彩旗，每隔4米插一面，从第一面旗到最后一面旗一共插了25面．后改成每隔6米插一面旗，一共有多少面旗不用移动．
<gadget id="calculator">25 - 1</gadget>
<output>24</output>

<gadget id="calculator">4 * 24</gadget>
<output>96</output>

<gadget id="calculator">96 / 12</gadget>
<output>8</output>

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

<result>9</result>