题解 | #统计每个月兔子的总数#
统计每个月兔子的总数
https://www.nowcoder.com/practice/1221ec77125d4370833fd3ad5ba72395
def tuzi(n):
a = 1
b = 0
c = 0
for i in range(0, n-3):
c = a
a = a + b
b = c
return a
n = int(input())
m = 1
if n == 1 or n == 2:
print(m)
elif n == 3:
m = 2
print(m)
else:
m = 2 * tuzi(n) + tuzi(n-1)
print(m)
