#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(N, 0);

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

    return 0;
}