There is a row of flowerpots on one side of Yingbin Avenue (both ends are placed), the distance between every two pots is 4m, and there are 55 potted flowers in total. Now it is necessary to put one pot every 3m. How many pots are there? Potted flowers do not need to be moved?
迎宾大道的一侧摆了一排花盆，(两端都摆了)，每两盆之间的距离是4m，共摆了55盆花，现在要改为每3m放一盆，请问有几盆花不用搬动？
<gadget id="calculator">55 - 1</gadget>
<output>54</output>

<gadget id="calculator">54 * 4</gadget>
<output>216</output>

<gadget id="calculator">216 / 12</gadget>
<output>18</output>

<gadget id="calculator">18 + 1</gadget>
<output>19</output>

<result>19</result>