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whatalnk/abc079-b.py

Created December 10, 2017 02:32
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AtCoder ABC #079
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abc079-b.py
l = [0] * 100
l[0] = 2
l[1] = 1
for i in range(2, 90):
l[i] = l[i-1] + l[i-2]
n = int(input())
print(l[n])
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