import itertools

D = [int(i) for i in input().split()]
D.sort()
a = False
for i in itertools.permutations(D):
	b = True
	for j in range(5):
		if i[j] < i[j + 1] and i[j] < i[j + 2] and i[j + 2] < i[j + 1] or i[j] < i[j + 2] and i[j + 1] < i[j] and i[j + 1] < i[j + 2]:
			continue
		b = False
		break
	if b:
		a = True
		break
if a:
	print('YES')
else:
	print('NO')