import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int std = (a + b - 1) / b;
		int sp = (a + c - 1) / c;
		if (sp * 3 > std * 2) {
		    System.out.println("NO");
		} else {
		    System.out.println("YES");
		}
	}
}