N = int(input())
A = list(map(int,input().split()))
m = 0
M = 0
p = 0
P = 0
for a in A:
	if a > 0:
		p += 1
		P += a
	elif a < 0:
		m += 1
		M += a
if -M >= P and m <= p:
	print('Yes')
elif -M <= P and m >= p:
	print('Yes')
else:
	print('No')