You would multiply 2x4 and 3x4 and it would be 8/12 so that leaves you with 4 twelths left.
56*365=20440
56/4=14 (this is how many leap years are within 56 years)
20440+14=20454 days
The power of 25 on the variable z needs to be changed. It has to be divisible by 3.