package m.shin;
import java.util.Scanner;
public class Con218 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int a = s.nextInt() , b = s.nextInt() , c = s.nextInt();
		s.close();

		int n = a / b , m = a / c;
		if(n * b < a){
			n++;
		}
		if(m * c < a){
			m++;
		}

		if(3 * m <= 2 * n){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}

	}

}