n = int(input())
p = []; q = []
for v in map(int,input().split()):
    if v>0: p.append(v)
    else: q.append(-v)
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")