import java.util.Scanner;

public class Main {
    static public void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble();
        double b = sc.nextDouble();
        double c = sc.nextDouble();

        int normal=(int)(a/b+0.99999999);
        int event =(int)(a/c+0.99999999);

        if (normal*2/3 >= event)
            System.out.println("YES");
        else
            System.out.println("NO");
    }
}