an class="p">]</span>
                    <span class="o">+</span> <span class="n">p</span><span class="p">[</span><span class="s2">&quot;b&quot;</span><span class="p">]</span> <span class="o">*</span> <span class="n">n</span><span class="p">[</span><span class="n">j</span><span class="p">]</span>
                    <span class="o">+</span> <span class="n">p</span><span class="p">[</span><span class="s2">&quot;c&quot;</span><span class="p">]</span> <span class="o">*</span> <span class="n">n</span><span cla