A row of flowers is placed on the side of a road in a certain city. The distance between every two potted flowers is 4 meters, and there are 55 potted flowers in total. Now it is necessary to put a potted flower every 3 meters. How many potted flowers do not need to be moved?
在某城市的一条路旁摆放一排花，每两盆花之间相距4米，共摆放55盆花，现在要改成每3米放一盆花，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>