import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final long a = sc.nextLong();
		final long b = sc.nextLong();
		final long c = sc.nextLong();
		
		final long normal = (a + b - 1) / b;
		final long reinforce = (a + c - 1) / c;
		
		System.out.println(reinforce * 3 <= normal * 2 ? "YES" : "NO");
		
	}
	
}