题目：古典问题：有一对兔子，从出生后第3个月起每个月都生一对兔子，

小兔子长到第三个月后每个月又生一对兔子，假如兔子都不死，

问每个月的兔子总数为多少？

这是一个菲波拉契数列问题-Title: Classical problem: There is one pair of rabbits, from the first three months after the birth of every month from birth to a pair of rabbits, bunnies grow up to the third month after the month gave birth to one pair of rabbits, if the rabbit is not dead, and asked Rabbit is the total number of each month? This is a Fibonacci sequence problems Appalachian