#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for (auto &el : a) cin >> el;
    a.push_back(0); ++n;

    long long ans = 1, pref = 1, suff = 1, all = 1;
    int cntu = 0, st = -1, en = -1;
    for (int i = 0; i < n; ++i) {
        if (a[i] == 0) {
            if (cntu % 2 == 0) {
                ans = max(ans, all);
            } else {
                ans = max(ans, max(all / pref, all / suff));
            }
            pref = suff = all = 1;
            continue;
        }
        if (a[i] < 0) {
            ++cntu;
            if (st == -1) { st = i; pref *= abs(a[i]); }
            en = i;
            suff = abs(a[i]);
        }
        all *= abs(a[i]);
        if (st == -1) pref *= a[i];
        suff *= a[i];
    }
    cout << ans << '\n';
    return 0;
}