# -*- coding:utf-8 -*-
import math

if __name__ == "__main__":
	a = input()
	b = input()
	c = input()
	exp1 = math.ceil(a / float(b))
	exp2 = math.ceil(a / float(c))
	if exp1 * 2 / 3 >= exp2:
		print "YES"
	else:
		print "NO"