n = gets.chomp.to_i
ary = []
i = 0
kyotaku = 30 * n

ary = gets.chomp.split

ary.each do |s|
  i += s.to_i
end

line = i / 10

ary.each do |s|
  if s.to_i > line
    kyotaku -= 30
  end
end

  puts kyotaku