#coding: UTF-8

import sys
import re
import itertools
from collections import deque

### defs ###

### main ###
a,b,c = map(int,sys.stdin.readlines())
if (a%b==0):
	bc=a//b
else:
	bc=a//b + 1
if (a%c==0):
	cc=a//c
else:
	cc=a//c + 1

if (cc*3<=bc*2):
	print('YES')
else:
	print('NO')