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max = 0
File.readlines('input.txt').map do |line|
line.tr('FBLR', '0101')
end.each do |line|
row = line.slice(0, 7).to_i 2
seat = line.slice(7, 3).to_i 2
id = row * 8 + seat
max = [id, max].max
end
puts max
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