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

happy_day()