#include<iostream>
#include<vector>
#include<algorithm>
#include<iomanip>
using namespace std;
#define OVERLOAD_REP(_1, _2, _3, name, ...) name
#define REP1(i, n) for (auto i = std::decay_t<decltype(n)>{}; (i) != (n); ++(i))
#define REP2(i, l, r) for (auto i = (l); (i) != (r); ++(i))
#define rep(...) OVERLOAD_REP(__VA_ARGS__, REP2, REP1)(__VA_ARGS__)
#define REP(i, l, r) rep(i, l, r+1)
#define all(x) (x).begin(),(x).end()
#define inf 1000000000
using ll = long long;
using P = pair<int,int>;
using Graph = vector<vector<int> >;

int main() {
    // 高速化
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    // 小数点の出力桁数を指定
    cout << fixed << setprecision(10);

    // メイン
    int N;
    cin >> N;
    int minus, zero, plus;
    minus = zero = plus = 0;
    rep(i, 0, N) {
        int a; cin >> a;
        if(a < 0) minus++;
        if(a == 0) zero++;
        if(a > 0) plus++;
    }
    int cnt;
    if(zero == 0) cnt = N-1;
    else cnt = N - 2;
    ll ans = 1;
    rep(i, 0, cnt) ans = 2 * ans % 998244353;
    if(zero == 0) cout << ans << endl;
    else cout << 3 * ans << endl;

    return 0;
}