Mingming started to practice brush calligraphy from January 1st. I wrote 1 character on the first day, and then I wrote 1 more character every day than the previous day. How many brush characters did he write in a year (ordinary year)?
明明从一月一日起开始练毛笔字，第一天写了1个字，以后每天都比上一天多写1个字．他一年(平年)写了多少个毛笔字？
<gadget id="calculator">1 + 365</gadget>
<output>366</output>

<gadget id="calculator">365 / 2</gadget>
<output>365/2 = around 182.5</output>

<gadget id="calculator">366 * (365/2)</gadget>
<output>66_795</output>

<result>66_795</result>