import math

levelup = float(raw_input())
sozai_norm = float(raw_input())
sozai_camp = float(raw_input())

need_norm = math.ceil(levelup/sozai_norm)
need_camp = math.ceil(levelup/sozai_camp)

#print need_norm, need_camp

if need_norm >= need_camp * 1.5:
    print "YES"
else:
    print "NO"