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# puts ARGF.read.lines.map(&:to_i).map {|mass|
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# (mass / 3.0).floor - 2
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# }.sum
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fuel = ->(mass) {
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total = 0
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loop do
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mass = (mass / 3.0).floor - 2
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break if mass <= 0
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total += mass
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end
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total
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}
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puts ARGF.read.lines.map(&:to_i).map(&fuel).sum
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