import java.util.Scanner;

public class No218 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble();
        double b = sc.nextDouble();
        double c = sc.nextDouble();
        
        int n = (int)Math.ceil(a/b);
        int k = (int)Math.ceil(a/c);

        if((n*2) >= (k*3)){
            System.out.println("YES");
        }else
            System.out.println("NO");
    }

}