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

if(a % b == 0):
	d = a / b
else:
	d = a / b + 1

if(a % c == 0):
	e =  a / c
else:
	e = a / c + 1

#print d
#print e
if(e * 3.0 / 2.0 <= d):
	print "YES"
else:
	print "NO"