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10 lines
166 B
Python
10 lines
166 B
Python
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def f(n):
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if n < 3:
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return 2
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if n % 2 == 0:
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return 2 * f(n - 2) - f(n - 1) + 2
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return 2 * f(n - 1) - f(n - 2) - 2
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print(f(17))
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