package src;

import java.util.*;
class B{
	static Scanner s = new Scanner(System.in);
	public static void main(String[] args) {
		int
			a=s.nextInt(),
			b=s.nextInt(),
			c=s.nextInt(),

			nb = (int)Math.ceil(1.0*a/b),
			nc = (int)Math.ceil(1.0*a/c);

		System.out.println((nb*2>=nc*3)?"YES":"NO");

	}
}