n = int(input(">>:"))
if n == 1:
print(1)
elif n == 2:
print(1)
else:
a=1
b=1
c=1
while (n-2)>0:
c=a+b
a=b
b=c
n-=1
print(c)
n=int(input("请输入n:"))
if n==1 or n==2:
print(1)
else:
p1, p2, current = 1, 1, 0
for index in range(3,n+1):
current=p1+p2
p1=p2
p2=current
print(current)
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