#include "bits/stdc++.h"

using namespace std;

#define pb push_back
#define mp make_pair
constexpr int INF = 1 << 29;
constexpr int MOD = 1000000007;
typedef long long ll;
typedef unsigned long long ull;

constexpr int dx[4] = {1, 0, -1, 0};
constexpr int dy[4] = {0, 1, 0, -1};

int main() {
    int N;
    cin >> N;

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

    vector<ll> dp_max(N, 0);
    vector<ll> dp_min(N, 0);

    dp_max[0] = dp_min[0] = A[0];
    for (int i = 1; i < N; i++) {
        dp_max[i] = max(dp_max[i], max(dp_max[i - 1] + A[i], dp_min[i - 1] + A[i]));
        dp_max[i] = max(dp_max[i], max(dp_max[i - 1] - A[i], dp_min[i - 1] - A[i]));
        dp_max[i] = max(dp_max[i], max(dp_max[i - 1] * A[i], dp_min[i - 1] * A[i]));
        if (A[i] != 0) dp_max[i] = max(dp_max[i], max(dp_max[i - 1] / A[i], dp_min[i - 1] / A[i]));
        dp_min[i] = min(dp_min[i], min(dp_min[i - 1] + A[i], dp_max[i - 1] + A[i]));
        dp_min[i] = min(dp_min[i], min(dp_min[i - 1] - A[i], dp_max[i - 1] - A[i]));
        dp_min[i] = min(dp_min[i], min(dp_min[i - 1] * A[i], dp_max[i - 1] * A[i]));
        if (A[i] != 0) dp_min[i] = min(dp_min[i], min(dp_min[i - 1] / A[i], dp_max[i - 1] / A[i]));
    }
    cout << dp_max[N - 1] << endl;

    return 0;
}