class Calc0166
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @h, @w, @n, @k = args.shift.map(&:to_i)
  end

  def calc
    n = @h * @w % @n
    n == 0 && @k == @n || @k == n
  end

  def run
    calc ? 'YES' : 'NO'
  end
end

puts Calc0166.new(STDIN.readlines).run if __FILE__ == $0