Along the side of the path, the colorful flags were inserted from the beginning, every 4 meters, and a total of 37 colored flags were inserted at the other end. If it is changed to insert a colored flag every 6 meters, how many colored flags can there be without moving.
沿小路一边从头开始插彩旗，每隔4米插一面，插到另外一端共插了37面彩旗．如果改成每隔6米插一面彩旗，可以有多少面彩旗不用移动．
<gadget id="calculator">37 - 1</gadget>
<output>36</output>

<gadget id="calculator">4 * 36</gadget>
<output>144</output>

<gadget id="calculator">144 / 12</gadget>
<output>12</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<result>13</result>