N = int(input())
A = list(map(int,input().split()))
P = []
M = []
for i in range(N):
    if A[i]>0:
        P.append(A[i])
    elif A[i]<0:
        M.append(A[i])
P = sorted(P,reverse=True)
M = sorted(M)
if len(P)>0:
    a = P.pop()
else:
    a = M.pop()
while True:
    if a>0:
        if len(M)>0:
            b = M.pop()
            a = a+b
        else:break
    else:
        if len(P)>0:
            b = P.pop()
            a = a+b
        else:break
if len(P)+len(M)==0:
    print("Yes")
else:
    print("No")