=</span> <span class="identifier">parse</span><span class="special">(</span><span class="identifier">input</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">input</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">r</span><span class="special">);</span>
<span class="keyword">if</span> <span class="special">(</span><span class="identifier">pi</span><sp