A building is 57 meters high, the height of the first floor is 2.6 meters, and the height of each other floor is 3.2 meters. How many floors does this building have?
一幢楼房高57米，一楼的层高是2.6米，其余每层的高度都是3.2米．这幢楼房一共有多少层？
<gadget id="calculator">57 - 2.6</gadget>
<output>54.4</output>

<gadget id="calculator">54.4 / 3.2</gadget>
<output>17</output>

<gadget id="calculator">17 + 1</gadget>
<output>18</output>

<result>18</result>