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#!/usr/bin/env ruby
input = gets.chomp.chars
ptr = 0
garbage = false
escape = false
lvl = 0
score = 0
input.each do |ch|
if escape then
escape = false
next
end
if ch == '!' then
escape = true
next
end
if garbage then
garbage = false if ch == '>'
next
end
if ch == '<' then
garbage = true
next
end
if ch == '{' then
lvl += 1
score += lvl
next
end
if ch == '}' then
lvl -= 1
next
end
end
puts score
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