MOD = 998244353
N = int(input())
A = list(map(int, input().split()))

neg = pos = 0
for a in A:
    if a < 0:
        neg += 1
    elif a > 0:
        pos += 1

res = 1
if neg > 1:
    res *= pow(2, neg-1, MOD)
if pos > 1:
    res *= pow(2, pos-1, MOD)
if neg > 0 and pos > 0:
    res *= 2
if 0 in A:
    res *= 3

print(res % MOD)