# -*- coding: utf-8 -*-
"""
No.218 経験値1.5倍
https://yukicoder.me/problems/no/218

"""
import sys
from sys import stdin
from math import ceil, floor
input = stdin.readline


def solve(a, b, c):
    normal = ceil(a / b)
    campaign = ceil(a / c)
    # print(normal, campaign)
    if floor(normal * 2 / 3) >= campaign:
        return 'YES'
    else:
        return 'NO'


def main(args):
    a = int(input())
    b = int(input())
    c = int(input())
    ans = solve(a, b, c)
    print(ans)


if __name__ == '__main__':
    main(sys.argv[1:])