#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++)
    {
        int64 n1 = minTable[i - 1] + a[i],
              n2 = minTable[i - 1] - a[i],
              n3 = minTable[i - 1] * a[i],
              n4 = maxTable[i - 1] + a[i],
              n5 = maxTable[i - 1] - a[i],
              n6 = maxTable[i - 1] * a[i];
        minTable[i] = min({n1, n2, n3, n4, n5, n6});
        maxTable[i] = max({n1, n2, n3, n4, n5, n6});

        if (a[i] != 0)
        {
            int64 n7 = minTable[i - 1] / a[i],
                  n8 = maxTable[i - 1] / a[i];
            minTable[i] = min({minTable[i], n7, n8});
            maxTable[i] = max({maxTable[i], n7, n8});
        }
    }
    cout << maxTable[N - 1] << endl;

    return 0;
}