#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int MOD = 998244353;

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    int n; cin >> n;
    vector<int> c(n);
    for (int i = 0; i < n; i++) cin >> c[i];
    vector<int> val = {0, 0, 0};
    for (int i = 0; i < n; i++) {
        if (c[i] < 0) val[0]++;
        else if (c[i] > 0) val[2]++;
        else val[1]++;
    }
    int res = 0;
    for (int i = 0; i < 3; i++) {
        if (val[i] > 0) res++;
    }
    ll ans = 1;
    if (res == 2) ans = 2;
    if (res == 3) ans = 6;
    auto pow2 = [&] (int exp) -> ll {
        ll ret = 1, base = 2;
        while (exp > 0) {
            if (exp & 1) ret = ret * base % MOD;
            base = base * base % MOD;
            exp >>= 1;
        }
        return ret;
    };
    if (val[0] > 1) ans = ans * pow2(val[0] - 1) % MOD;
    if (val[2] > 1) ans = ans * pow2(val[2] - 1) % MOD;
    cout << ans << "\n";
    return 0;
}