package yukicoder218;
import java.util.Scanner;
public class Main {
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		double a,b,c;
		a=sc.nextDouble();
		b=sc.nextDouble();
		c=sc.nextDouble();
		//通常必要経験値 a/b
		//キャンペーン中　a/c
		//   a/c<=a/b*2/3
		//   1/c<=1/b*2/3
		//   3b<=2c
		
		double d,e;
		if(a/c!=(int)(a/c)){
			d=(int)(a/c)+1;
		}else{
			d=a/c;
		}
		if(a/b!=(int)(a/b)){
			e=(int)(a/b)+1;
		}else{
			e=a/b;
		}
		if(3*d<=2*e){
			System.out.println("YES");
		}else{
			System.out.println("NO");
		}
	}
}