In a building with a height of 59 meters, the height of the first floor is 4.6 meters, and the height of each other floor is 3.2 meters. How many floors does this building have?
一幢高59米的楼房，第一层的层高4.6米，其余每层的层高都是3.2米，这幢楼房一共有几层？
<gadget id="calculator">59 - 4.6</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>