找规律 | HJ37 统计每个月兔子的总数

while True:
    try:
        n = int(input())
        if n <= 2:
            print(1)
        else:
            mature, child1, child2 = 1, 0, 0
            for i in range(2, n):
                mature += child2
                child2 = child1
                child1 = mature
            print(mature+child1+child2)
    except:
        break

用时：1h