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monkeys = $stdin.readlines
nums = {}
monkeys.count.times do |mix|
if monkeys[mix] =~ /(\d+)/
val = $1.to_i
nums[monkeys[mix][0...4]] = $1.to_i
monkeys[mix] = nil
end
end
monkeys.compact!
while nums["root"].nil?
monkeys.count.times do |mix|
f, a, b = monkeys[mix].scan(/[a-z]{4}/)
unless nums[a].nil? || nums[b].nil?
case monkeys[mix][11]
when ?+
nums[f] = nums[a] + nums [b]
when ?-
nums[f] = nums[a] - nums [b]
when ?*
nums[f] = nums[a] * nums [b]
when ?/
nums[f] = nums[a] / nums [b]
end
monkeys[mix] = nil
end
end
monkeys.compact!
end
puts nums["root"]
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