#include <iostream>
#include <vector>
#include <algorithm>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using mint = modint998244353;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vmi = vector<mint>;
using vvmi = vector<vmi>;
using vvvmi = vector<vvmi>;
#define all(a) (a).begin(), (a).end()
#define rep2(i, m, n) for (int i = (m); i < (n); ++i)
#define rep(i, n) rep2(i, 0, n)
#define drep2(i, m, n) for (int i = (m)-1; i >= (n); --i)
#define drep(i, n) drep2(i, n, 0)

int main(){
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int n; cin >> n;
    mint minus = 0, plus = 0, zero = 0;
    rep(i, n){
        int c; cin >> c;
        if(c < 0){
            minus++;
        }else if(c == 0){
            zero++;
        }else{
            plus++;
        }
    }
    mint ans = mint(1); mint two = mint(2);
    if(plus.val() > 0)ans *= two.pow(plus.val()-1);
    if(minus.val() > 0)ans *= two.pow(minus.val()-1);
    if(plus.val() > 0 && minus.val() > 0){
        ans *= mint(2) * mint(3).pow(zero.val());
    }else{
        ans *= mint(2).pow(zero.val());
    }
    cout << ans.val() << endl;
    

    return 0;
}