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20 lines
351 B
Python
20 lines
351 B
Python
def f(n, prev):
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if n == 24:
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return 1
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if n > 24:
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return 0
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s = 0
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if prev not in "12":
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s += f(n + 1, "1")
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if prev not in "12":
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s += f(n + 2, "2")
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if prev not in "34":
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s += f(n * 2, "3")
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if prev not in "34":
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s += f(n * 3, "4")
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return s
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print(f(1, "0"))
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