import java.util.Scanner;
public class Exp{
	public static void main(String[] arg){
		double ca;
		int temp,cneed,a,b,c;
		Scanner sc = new Scanner(System.in);
		a = sc.nextInt();
		b = sc.nextInt();
		c = sc.nextInt();
		temp = (int)a / (int)b;
		if(a > b * temp)temp++;
		ca = (double)temp * 2 /3;
		cneed = a / c;
		if(a > c * cneed)cneed++;
		if((double)cneed <= ca){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}
}