def happy_day()
  months = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
  happy_days = 0
  (1..12).each do |i|
    limit = months[i - 1]
    (1..limit).each do |j|
      l = j / 10
      r = j % 10
      happy_days += 1 if i == l + r
    end
  end
  puts happy_days
end

happy_day()