2021-02-18 18:19:09 +00:00
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timbitsLeft = int(input())
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totalCost = 0
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bigBoxes = int(timbitsLeft / 40)
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totalCost = bigBoxes * 6.19
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timbitsLeft -= 40 * bigBoxes
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if timbitsLeft >= 20:
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totalCost += 3.39
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timbitsLeft -= 20
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if timbitsLeft >= 10:
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totalCost += 1.99
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timbitsLeft -= 10
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2021-02-18 18:19:33 +00:00
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totalCost += timbitsLeft * 0.20
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2021-02-18 18:19:09 +00:00
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print(totalCost)
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