package me.yukicoder;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No0218 {
	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());

		System.out.println(a / c * 1.5 >= a / b ? "YES" : "NO");
	}
}