class Date
  def heisei? = (Date.new(1989, 1, 8)..Date.new(2019, 4, 30)) === self
end

class TrueClass
  def to_s = "Yes"
end

class FalseClass
  def to_s = "No"
end

require "date"
puts Date.new(*gets.split(" ").map(&:to_i)).heisei?