#include <bits/stdc++.h>
using namespace std;

using int64 = long long;
using uint64 = unsigned long long;

constexpr int MAX_N = 16;
constexpr int64 INF = (1LL << 50);

int64 minTable[MAX_N], maxTable[MAX_N];

int main()
{
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int N;
    cin >> N;

    vector<int64> a(N);
    for (int i = 0; i < N; i++)
    {
        cin >> a[i];
    }

    minTable[0] = maxTable[0] = a[0];
    for (int i = 1; i < N; i++)
    {
        minTable[i] = INF;
        maxTable[i] = -INF;

        for (int64 v : {minTable[i - 1], maxTable[i - 1]})
        {
            for (char op : "+*-/")
            {
                if (a[i] == 0 and op == '/') continue;

                int64 nv;
                switch (op)
                {
                    case '+': nv = v + a[i]; break;
                    case '-': nv = v - a[i]; break;
                    case '*': nv = v * a[i]; break;
                    case '/': nv = v / a[i]; break;
                }
                minTable[i] = min(minTable[i], nv);
                maxTable[i] = max(maxTable[i], nv);
            }
        }
    }
    cout << maxTable[N - 1] << endl;

    return 0;
}