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); double e = Math.ceil(a/c); if(e < d * (2/3)){ System.out.println("YES"); } else{ System.out.println("NO"); } } }