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());

        if ((double)a / c <= ((double)a / b) * (2.0 / 3.0)) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
    }
}