import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		double n = sc.nextDouble();
		double a = sc.nextDouble();
		double b = sc.nextDouble();
		double a_num = Math.ceil(n/a);
		double b_num = Math.ceil(n/b);
		System.out.println(b_num<=a_num*2/3?"YES":"NO"); 
	}
}