题解 | #兔子的数量#
兔子的数量
https://www.nowcoder.com/practice/8783056676de4396b0bf816a3561d62f
x1 = 2
x2 = 3
y = int(input())
if(y == 1):
print(x1)
elif(y == 2):
print(x2)
else:
for i in range(y - 2):
a = x1 + x2
x1 = x2
x2 = a
print(a)
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