import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        
        int no = (int)Math.ceil( (double)a/b) ;
        int ca = (int)Math.ceil( (double)a/c) ;
        double r = (double)no/ca;
        if(r>=1.5){
            System.out.println("YES");
        }else{
            System.out.println("NO");
        }
    }
}