#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const ll INF = 10000000000000000;

ll dp[16][2];

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n;
	cin >> n;
	vector<ll> a(n);
	for (int i = 0; i < n; i++) cin >> a[i];

	dp[0][0] = a[0];
	dp[0][1] = a[0];
	for (int i = 1; i < n; i++) {
		dp[i][0] = -INF;
		dp[i][1] = INF;
		ll tmp;
		tmp = dp[i - 1][0] * a[i];
		dp[i][0] = max(dp[i][0], tmp);
		dp[i][1] = min(dp[i][1], tmp);
		tmp = dp[i - 1][1] * a[i];
		dp[i][0] = max(dp[i][0], tmp);
		dp[i][1] = min(dp[i][1], tmp);
		tmp = dp[i - 1][0] + a[i];
		dp[i][0] = max(dp[i][0], tmp);
		dp[i][1] = min(dp[i][1], tmp);
		tmp = dp[i - 1][1] + a[i];
		dp[i][0] = max(dp[i][0], tmp);
		dp[i][1] = min(dp[i][1], tmp);
		tmp = dp[i - 1][0] - a[i];
		dp[i][0] = max(dp[i][0], tmp);
		dp[i][1] = min(dp[i][1], tmp);
		tmp = dp[i - 1][1] - a[i];
		dp[i][0] = max(dp[i][0], tmp);
		dp[i][1] = min(dp[i][1], tmp);
		if (a[i] == 0) continue;
		tmp = dp[i - 1][0] / a[i];
		dp[i][0] = max(dp[i][0], tmp);
		dp[i][1] = min(dp[i][1], tmp);
		tmp = dp[i - 1][1] / a[i];
		dp[i][0] = max(dp[i][0], tmp);
		dp[i][1] = min(dp[i][1], tmp);
	}
	cout << dp[n - 1][0] << endl;
	return 0;
}