#include <cstdio>
#include <vector>
#include <limits>
#define repeat(i,n) for (int i = 0; (i) < int(n); ++(i))
using ll = long long;
using namespace std;
template <class T> inline void setmax(T & a, T const & b) { a = max(a, b); }
template <class T> inline void setmin(T & a, T const & b) { a = min(a, b); }
int main() {
    int n; scanf("%d", &n);
    vector<int> a(n); repeat (i,n) scanf("%d", &a[i]);
    ll cur_min = a[0];
    ll cur_max = a[0];
    repeat (i,n-1) {
        ll nxt_min = numeric_limits<ll>::max();
        ll nxt_max = numeric_limits<ll>::min();
        for (ll cur : { cur_min, cur_max }) {
            for (char op : "+-*/") {
                if (op == '/' and a[i+1] == 0) continue;
                ll nxt;
                switch (op) {
                    case '+': nxt = cur + a[i+1]; break;
                    case '-': nxt = cur - a[i+1]; break;
                    case '*': nxt = cur * a[i+1]; break;
                    case '/': nxt = cur + a[i+1]; break;
                }
                setmin(nxt_min, nxt);
                setmax(nxt_max, nxt);
            }
        }
        cur_min = nxt_min;
        cur_max = nxt_max;
    }
    printf("%lld\n", cur_max);
    return 0;
}