package me.yukicoder;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.math.RoundingMode;

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());
		BigDecimal cntUp = new BigDecimal(a / b).setScale(0, RoundingMode.UP);
		BigDecimal cntUp_campaign = new BigDecimal(a / c).setScale(0, RoundingMode.UP);
		// ⇔通常時の2/3の割合で足りているか
		int ret = cntUp.compareTo(cntUp_campaign.multiply(new BigDecimal("1.5")));				
		
		System.out.println(ret >= 1 ? "YES" : "NO");
	}
}