import java.util.*;

public class Exercise73{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    double a = sc.nextDouble();
    double b = sc.nextDouble();
    double c = sc.nextDouble();

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