# -*- coding: utf-8 -*-

import math

a = int(input())
b = int(input())
c = int(input())

number = 0
c_number = 0

if a % b == 0:
    number = a / b
else:
    number = a // b + 1

if a % c == 0:
    c_number = a / c
else:
    c_number = a // c + 1

h_number = float(number) * 2 / 3

if c_number <= h_number:
    print('YES')
else:
    print('NO')