#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
int INF = 1e9;
int MOD = 1000000007;
main(){
    int N,a;
    cin >> N >> a;
    ll mini = a,maxi = a;
    for(int i = 1;i < N;i++){
        vector<ll> v;
        cin >> a;
        v.push_back(maxi + a);
        v.push_back(maxi - a);
        v.push_back(maxi * a);
        v.push_back(mini + a);
        v.push_back(mini - a);
        v.push_back(mini * a);
        if(a){
            v.push_back(maxi / a);
            v.push_back(mini / a);
        }
        maxi = max(maxi,*max_element(v.begin(),v.end()));
        mini = min(mini,*min_element(v.begin(),v.end()));
    }
    cout << maxi << endl;
}