因此每隔四年，二月二十九日就会加进日历里。
Therefore, every four years, February 29 is added to the calendar.
二月二十九日不是假日，但因为它每四年才来一次，所以依然十分特别。
February 29 is not a holiday, but it is still special because it only comes once every four years.
顺便说一下，这个假设还意味着我们不需要计算闰年，特别是这个问题中没有人生于二月二十九日。
Incidentally, the assumption also implies that we do not count leap years. In particular, nobody in this problem is born on February 29.
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