20 lines
327 B
Python
20 lines
327 B
Python
# * * * * *
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# * * or * * *
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# * * * * *
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if __name__ == "__main__":
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N = int(input())
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if N != 1:
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sqn = 0
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while sqn**2 < N:
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sqn += 1
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if (sqn - 1) * sqn > N:
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a = (sqn - 2 + sqn - 1) * 2
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else:
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a = (sqn - 1) * 4
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else:
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a = 4
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print(a)
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