package yukicoder;

import java.util.Scanner;

public class yuki218 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scan = new Scanner(System.in);
		double a = scan.nextDouble();
		double b = scan.nextDouble();
		double c = scan.nextDouble();
		
		double a1 = (a/b); 
		double a2 = Math.ceil(a/c);
		if ((a2/a1)<=(2.0/3.0)) {
			System.out.println("YES");
		} else {
			System.out.println("NO");			
		}
		scan.close();

	}

}