N = int(input())
A = list(map(int,input().split()))

if N == 1:
  print('Yes')
  exit()

B = []
for a in A:
  if a == 0:
    continue
  B.append(a)

if len(B) <= 1:
  print('Yes')
  exit()

B.sort()
ans = 'No'
if B[0] > 0:
  print(ans)
  exit()
if B[-1] < 0:
  print(ans)
  exit()

S = sum(B)
if S - B[0] >= 0 and S <= 0:
  ans = 'Yes'
if S - B[-1] <= 0 and S >= 0:
  ans = 'Yes'
print(ans)