# 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？
print('----------first------------')
while True:
month = input('What month do you want to enter:')
if month.isdigit():
month = int(month)
a = 0
b = 1
count = 0
while count < month-1:
a,b = b,a+b
count += 1
print(b)
else:
print('Invalid input!')
print('----------second---------------')
month = input('What month do you want to enter:')
if month.isdigit():
month = int(month)
a = 0
b = 1
for i in range(month-1):
# print(b)
a,b = b,a+b
print(b)
else:
print('Invalid input!')
