mod = 998244353
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

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

    if N == 1:
        print(665496236)
    else:
        S = sum(A)
        if S & 1:
            lower = pow(3, S, mod)
            upper = ((lower + 1) * pow(2, mod-2, mod))%mod
            print((upper * pow(lower, mod-2, mod))%mod)
        else:
            lower = pow(3, S, mod)
            upper = ((lower - 1) * pow(2, mod - 2, mod)) % mod
            print((upper * pow(lower, mod - 2, mod)) % mod)


if __name__ == '__main__':
    main()