require "date"

year = Date.new(2015, 1, 1)
count = 0
365.times do |i|
  year += i
  # 月と日付を取得して、分割すればよい
  if year.month[0] + year.month[1] == year.day[0] + year.day[1]
    count += 1
  end
end

puts count