require 'date'

class Yukicoder
  def initialize
    @n = gets.to_i
  end

  def run
    origin_wday = Date.parse('20140723').wday

    cnt = 0
    2015.upto(@n) do |y|
      d = Date.new(y, 7, 23)
      cnt += 1 if d.wday == origin_wday
    end
    cnt
  end
end

puts Yukicoder.new.run