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

long long mod = 998244353;

long long power(long long a, long long b, long long m)
{
    long long r = 1;
    for (long long i = 0; i < b; i++)
    {
        r *= a;
        r %= m;
    }
    return r;
}

int main()
{
    long long n;
    cin >> n;
    vector<long long> c(n);
    bool flag = false;
    for (long long i = 0; i < n; i++)
    {
        cin >> c[i];
        if (c[i] == 0)
        {
            flag = true;
        }
    }
    sort(c.begin(), c.end());
    long long ans = 0;
    long long l = 0;
    long long r = n - 1;
    long long mid = 0;
    if (c[0] >= 0)
    {
        cout << power(2, n - 1, mod) << endl;
    }
    else if (c[n - 1] <= 0)
    {
        cout << power(2, n - 1, mod) << endl;
    }
    else
    {
        if (n == 2)
        {
            cout << 2 << endl;
            return 0;
        }
        long long ans = power(2, n - 3, mod);
        if (flag)
        {
            ans *= 3;
            ans %= mod;
        }
        else
        {
            ans *= 2;
            ans %= mod;
        }
        ans *= 2;
        ans %= mod;
        cout << ans << endl;
    }
}