16 lines
306 B
Python
16 lines
306 B
Python
N = int(input())
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I = [int(input()) for i in range(N)]
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T = [[0 for _ in range(3)] for _ in range(N)]
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T[0][0] = 0
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T[0][1] = I[0]
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T[0][2] = 0
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for i in range(1, N):
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T[i][0] = max((T[i-1][0], T[i - 1][1], T[i - 1][2]))
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T[i][1] = T[i - 1][0] + I[i]
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T[i][2] = T[i - 1][1] + I[i]
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print(max(T[-1]))
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