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whatalnk/agc012-a.rb

Created April 11, 2017 14:12
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AtCoder AGC #012
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agc012-a.rb
n = gets.chomp.to_i
a = gets.chomp.split(" ").map(&:to_i).sort
ret = 0
(3 * n - 2).step(n, -2) do |i|
ret += a[i]
end
puts ret
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