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));
		double a = Double.parseDouble(br.readLine());
		int b = Integer.parseInt(br.readLine());
		int c = Integer.parseInt(br.readLine());

		// 通常時の2/3の割合で足りているか
		System.out.println(b * 2 >= c * 3 ? "YES" : "NO");
	}
}