import java.util.*; public class test { public static void main(String[] args) { Scanner sc = new Scanner(System.in); double a = sc.nextDouble(); double b = sc.nextDouble(); double c = sc.nextDouble(); double d = Math.ceil(a/b) * 2/3; double e = Math.ceil(a/c); if(e <= d){ System.out.println("YES"); } else{ System.out.println("NO"); } } }