On the morning of February 29, 2008, the playground and the rostrum of our school were very lively! Huh? What is this? Oh, it turned out that several students explained on the stage why there are 29 days in February of leap year: "In the compilation of the Gregorian calendar, there is a leap every four years, because the earth rotates once every 23 hours and 56 minutes, nearly 24 hours after four years, and then there is a day every 400 years, so it is not allowed to leap every 100 years. (So there must be one more day every four years, and one more day is still not accurate enough, and there will be a small error. Therefore, there can only be 97 more days every 400 years, which is the most accurate Gregorian calendar at present. Therefore, the Gregorian calendar stipulates that every year that happens to be 100 must be divisible by 400, which is a leap year. However, the number of years that happens to be 100 must be divisible by 400. Everything else is a normal year. There are 29 days in February of leap year. " How's it going? Interesting! In fact, careful people will find this interesting phenomenon, which has something to do with the familiar Olympic Games! Because the "leap every four years" Olympic Games is also held every four years. For example, the Atlanta Olympic Games in 1996 and the Sydney Olympic Games in 2000? Unexpectedly, olympiad and mathematics are also inextricably linked! If you still know something about the relationship between olympiad and mathematics, let's show our skills at the Mathematics Festival in March!