#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int N; cin >> N;
    vector<ll> a(N);
    rep(i,N) cin >> a[i];

    ll ma = a[0], mi = a[0];
    rep(i,N) if(i) {
        ll nt_ma = max({ma + a[i], ma - a[i], ma * a[i], mi + a[i], mi - a[i], mi * a[i]});
        ll nt_mi = min({ma + a[i], ma - a[i], ma * a[i], mi + a[i], mi - a[i], mi * a[i]});
        if(a[i] != 0) {
            nt_ma = max({nt_ma, ma / a[i], mi / a[i]});
            nt_mi = min({nt_mi, ma / a[i], mi / a[i]});
        }
        tie(ma, mi) = make_pair(nt_ma, nt_mi);
    }
    cout << ma << endl;
}