N=int(input())
C=list(map(int,input().split()))
if N==1:
    print(1)
    exit()
ans=1
if min(C)<0<max(C):
    ans*=2
zero_count =0
if 0 in C:
    if min(C)<0<max(C):
        if 0 in C:
            zero_count+=1
        ans*=3
    else:
        ans*=2
p=998244353
ans*=pow(2,max(0,N-2-zero_count),p)
print(ans%p)