题解 | #统计每个月兔子的总数#

import sys
while 1:
    try:
        n=int(input())
        if n<3:
            print('1')
        elif n>=3:
            d=[1,1]
            b=0
            for i in range(2,n):
                aa=d[i-2]
                bb=d[i-1]
                d.append(int(aa)+int(bb))
            print(d[n-1])
            
    except:
        break