import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        long a = Long.parseLong(sc.next());
        long b = Long.parseLong(sc.next());
        long c = Long.parseLong(sc.next());
        
        System.out.println(((int)Math.ceil((double)a / c) <= (int)Math.ceil((double)(int)Math.ceil((double)a / b) * (2.0 / 3.0)))? "YES" : "NO");
    }
}