t><div>一个整数表示答案.</div>
<p></p></div></div></div></div></div><div class="row"><div class="column"><h4 class="ui top attached block header">样例</h4><div class="ui bottom attached segment font-content"><div style="position: relative; overflow: hidden;"><h4>样例输入</h4><div class="ui existing segment"><pre style="margin-top:0; margin-bottom:0;"><code class="lang-plain">
			<div class=content><span class=sampledata>4<br />
NYNY<br />
NNYN<br />
YNNN<br />
YNNN<br />
6 100  </span></