import java.util.Scanner;


public class Main_yukicoder218 {

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