Xiao Ming insisted on practicing brush calligraphy every day, and practiced a total of 84 big characters in a week. According to this calculation, how many big characters did Xiao Ming practice in October.
小明每天坚持练习毛笔字，一个星期共练了84个大字，照这样计算，小明十月份一共练了多少个大字．
<gadget id="calculator">84 * 31</gadget>
<output>2_604</output>

<result>2_604</result>