import java.util.*;

class No0218{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		double bb, cc;

		if(a % b == 0){
			bb = a / b;
		}else{
			bb = a / b + 1;
		}

		if(a % c == 0){
			cc = a / c;
		}else{
			cc = a / c + 1;
		}

		if((bb / 3) * 2 >= cc){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}
}