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 bb = (a + b - 1) / b;
        int cc = (a + c - 1) / c;
        if (bb * 2 / 3 >= cc) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
  }
}