#!/usr/bin/env ruby

require 'date'
class Date
	def happy_day?
		month = self.month
		day = self.day
		a = day / 10
		b = day % 10
		if [a,b].sum == month
			true
		else
			false
		end
	end
end


iday = Date.new(2015, 1, 1)

hday = 0
while (iday.year < 2016)
  hday += 1 if iday.happy_day?
  iday = iday.next_day
end

p hday