From June 15th to July 4th, Xiao Ming wrote an average of 24 big characters every day. How many big characters did he become famous in total?
小明从6月15日到7月4日，平均每天写24个大字，他一共红了多少个大字？
<gadget id="calculator">30 - 15</gadget>
<output>15</output>

<gadget id="calculator">15 + 1 + 4</gadget>
<output>20</output>

<gadget id="calculator">24 * 20</gadget>
<output>480</output>

<result>480</result>