import java.io.*;
import java.util.*;

class Main218 {
	
	public static void out (Object o) {
		System.out.println(o);
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		int a = Integer.parseInt(br.readLine());
		int b = Integer.parseInt(br.readLine());
		int c = Integer.parseInt(br.readLine());
		
		int normalCnt  = (double)a / b == a / b ? a / b : a / b + 1;
		int specialCnt = (double)a / c == a / c ? a / c : a / c + 1;
		
		//out("spCnt : " + specialCnt + "\tnoCnt : " + normalCnt);
		
		out(((double)normalCnt * 2 / 3.0) >= specialCnt ? "YES" : "NO");
		
	}
}