#coding: utf-8
##yuki_218
import math

a=int(raw_input())
b=int(raw_input())
c=int(raw_input())

x=int(math.ceil(1.0*a/b))
y=int(math.ceil(1.0*a/c))

if 1.0*x/y>=1.5:
 print "YES"
else:
 print "NO"