7 lines
151 B
Python
7 lines
151 B
Python
P = [0, 1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1]
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_ = input()
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hotels = list(map(int, input().split()))
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print(sum([P[i - 1] for i in hotels if i <= 12]) / 36)
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