#include <bits/stdc++.h>

#define show(x) cerr << #x << " = " << x << endl

using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;

template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v)
{
    os << "sz=" << v.size() << "\n[";
    for (const auto& p : v) {
        os << p << ",";
    }
    os << "]\n";
    return os;
}

template <typename S, typename T>
ostream& operator<<(ostream& os, const pair<S, T>& p)
{
    os << "(" << p.first << "," << p.second
       << ")";
    return os;
}


constexpr ll MOD = 1e9 + 7;

template <typename T>
constexpr T INF = numeric_limits<T>::max() / 100;

ll op(int code, ll l, ll r, ll out)
{
    if (code == 0) {
        return l + r;
    } else if (code == 1) {
        return l - r;
    } else if (code == 2) {
        return l * r;
    } else if (r != 0) {
        return l / r;
    } else {
        return out;
    }
}

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll n;
    cin >> n;
    vector<ll> a(n);
    for (ll i = 0; i < n; i++) {
        cin >> a[i];
    }
    vector<vector<ll>> dp(n, vector<ll>{-INF<ll>, INF<ll>});  //max,min
    dp[0][0] = a[0];
    dp[0][1] = a[0];
    for (int i = 1; i < n; i++) {
        for (int code = 0; code < 4; code++) {
            dp[i][0] = max(dp[i][0], op(code, dp[i - 1][0], a[i], -INF<ll>));
            dp[i][0] = max(dp[i][0], op(code, dp[i - 1][1], a[i], -INF<ll>));
            dp[i][1] = min(dp[i][1], op(code, dp[i - 1][1], a[i], INF<ll>));
            dp[i][1] = min(dp[i][1], op(code, dp[i - 1][0], a[i], INF<ll>));
        }
    }
    cout << dp[n - 1][0] << endl;

    return 0;
}