A TV series started broadcasting on July 16 and ended on August 5, for a total of several days. How many
一部电视剧从7月16日开始播放，到8月5日结束，共播放了几天．多少
<gadget id="calculator">31 - 16</gadget>
<output>15</output>

<gadget id="calculator">15 + 1 + 5</gadget>
<output>21</output>

<result>21</result>