n = int(input()); p = []; q = []; z = False
for v in map(int,input().split()):
    if v>0: p.append(v)
    elif v<0: q.append(-v)
    else: z = True
if n==1: exit(print("Yes"))
if z and not p: p.append(0)
if z and not q: q.append(0)
if not p or not q: exit(print("No"))
p.sort(); q.sort(); r = sum(p); s = sum(q)
if r>s: p,q = q,p
print("Yes" if s-q[-1]<r else "No")