#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;

int main() {
    long long N;
    cin >> N;
    long long a[N];
    for (int i = 0; i < N; i++) cin >> a[i];
    long long max_ = a[0], min_ = a[0];
    for (int i = 1; i < N; i++) {
        max_ = max({
            max_ + a[i],
            max_ - a[i],
            max_ * a[i],
            (a[i] ? max_ / a[i] : max_ * a[i]),
            min_ + a[i],
            min_ - a[i],
            min_ * a[i],
            (a[i] ? min_ / a[i] : min_ * a[i]),
        });
        min_ = min({
            max_ + a[i],
            max_ - a[i],
            max_ * a[i],
            (a[i] ? max_ / a[i] : max_ * a[i]),
            min_ + a[i],
            min_ - a[i],
            min_ * a[i],
            (a[i] ? min_ / a[i] : min_ * a[i]),
        });
    }
    cout << max_ << endl;
}