import sys
input = sys.stdin.readline

N=int(input())
C=list(map(int,input().split()))

mod=998244353

MAX=max(C)
MIN=min(C)

if MIN>=0:
    ANS=1
    for c in C:
        if c!=MAX:
            ANS=ANS*2%mod

    print(ANS)

elif MAX<=0:
    ANS=1
    for c in C:
        if c!=MIN:
            ANS=ANS*2%mod

    print(ANS)

else:
    ANS=2
    for c in C:
        if c==0:
            ANS=ANS*3%mod
        elif c!=MIN and c!=MAX:
            ANS=ANS*2%mod

    print(ANS)