其实就是个数列:

月份=》兔子数
1=》1
2=》1
3=》2
4=》3
5=》5
6=》8
7=》13
8=》21
9=》34
...

def demo(month):
    if month==1 or month==2:
        return 1
    return demo(month-1)+demo(month-2)


import sys

for line in sys.stdin:
    for i in line.split():
        print(demo(int(i)))