#!/usr/bin/python
from fractions import Fraction
from math import ceil

a = Fraction(raw_input())
b = Fraction(raw_input())
c = Fraction(raw_input())
x = int(ceil(a / b))
y = int(ceil(a / c))
if x * Fraction('2/3') >= y:
    res = 'YES'
else:
    res = 'NO'
print res