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");
        }
    }
}