 class=content><div>输出一个整数ans，至少被K个扇形所覆盖的总面积等于&pi;/2m&times;ans</div>
<div>保证答案不超过2^63-1</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">
			