class Calc0218
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @a = args.shift.first.to_i
    @b = args.shift.first.to_i
    @c = args.shift.first.to_i
  end

  def calc
    cb = (@a / @b) + (@a % @b == 0 ? 0 : 1)
    cc = (@a / @c) + (@a % @c == 0 ? 0 : 1)
    2 * cb >= 3 * cc
  end

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

puts Calc0218.new(STDIN.readlines).run if __FILE__ == $0