#include <bits/stdc++.h>
using namespace std;

#define For(i, a, b) for(int i = (a); i < (b); i++)
#define rep(i, n) For(i, 0, n)
#define rFor(i, a, b) for(int i = (a); i >= (b); i--)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()

using lint = long long;
using ld = long double;

int INF = 2000000000;
lint LINF = 1000000000000000000;

struct SetupIo {
    SetupIo() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
        cout << fixed << setprecision(15);
    }
} setupio;

#include <atcoder/modint>
using mint = atcoder::modint998244353;

int main() {
    int n;
    cin >> n;
    int minus = 0, zero = 0, plus = 0;
    rep(i, n) {
        int c;
        cin >> c;
        if (c < 0) {
            minus++;
        } else if (c == 0) {
            zero++;
        } else {
            plus++;
        }
    }
    mint Minus = mint(2).pow(max(0, minus - 1));
    mint Plus = mint(2).pow(max(0, plus - 1));
    mint ans = Minus * Plus;
    if (minus > 0 && plus > 0) {
        ans *= 2;
        if (zero > 0) {
            ans *= 3;
        }
    } else {
        if (zero > 0) {
            ans *= 2;
        }
    }
    cout << ans.val() << "\n";
}