</a><span class="lineno">   27</span>&#160;   N = \sage{Number_of_storeys}</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;\end{equation}</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;\begin{sagesilent}</div>
<div class="line"><a name="l00032"></a><span class="lineno"