N = int(input())
A = list(map(int, input().split()))
p, m = [], []
for a in A:
    if a > 0:
        p.append(a)
    elif a < 0:
        m.append(-a)
        
if len(p) + len(m) == 1:
    print("Yes")
    exit()
if len(p) == 0 or len(m) == 0:
    print("No")
    exit()
    
p.sort()
m.sort()
if sum(p[:-1]) <= sum(m) or sum(m[:-1]) <= sum(p):
    print("Yes")
else:
    print("No")