There is a method of using six digits to represent the date, such as using 911206 to represent December 6, 1991, that is, use the first two digits to represent the year, the middle two digits to represent the month, and the last two digits to represent the day. If the date of 1997 is expressed in this way, how many days in the whole year are the dates with different six numbers?
有一种用六位数表示日期的方法，如用911206表示91年12月6日，也就是用前两位表示年，中间两位表示月，后两位表示日．如果用这种方法表示1997年的日期，全年中六个数字都不相同的日期共有多少天？
<gadget id="calculator">5 + 5 + 10 + 10 + 11 + 11 + 10 + 5 + 6</gadget>
<output>73</output>

<result>73</result>