A building is 77.9 meters high. Except for the first floor, which is 5.4 meters high, the height of each floor is 2.9 meters. How many floors does this building have?
一幢楼房高77.9米，除一楼高度是5.4米外，其余每层的高度都是2.9米．这幢楼房一共有多少层？
<gadget id="calculator">77.9 - 5.4</gadget>
<output>72.5</output>

<gadget id="calculator">72.5 / 2.9</gadget>
<output>25</output>

<gadget id="calculator">25 + 1</gadget>
<output>26</output>

<result>26</result>