#include <bits/stdc++.h>
using namespace std;
#define FOR(i, n) for(int i = 0; i < (n); i++)
#define MEM(a, x) memset(a, x, sizeof(a))
#define ALL(a) a.begin(), a.end()
#define UNIQUE(a) a.erase(unique(ALL(a)), a.end())
typedef long long ll;
typedef pair<int, int> P;

int n;
ll a[20];

int main(int argc, char const *argv[]) {
	ios_base::sync_with_stdio(false);
	cin >> n;
	int minus = 0;
	vector<int> pos;
	FOR(i, n) {
		cin >> a[i];
		if (a[i] < 0) {
			minus++;
			pos.push_back(i);
		}
	}
	if (minus & 1) {
		ll ans = -1<<60;
		for (int p : pos) {
			ll ret = -a[p], ret2 = 1;
			if (p == 0) ret *= -1;
			FOR(i, n) {
				if (i == p || a[i] == 0) continue;
				ret2 *= a[i];
			}
			ret += ret2;
			ans = max(ans, ret);
		}
		cout << ans << endl;
	}
	else {
		ll ret = 1;
		FOR(i, n) {
			if (a[i] == 0) continue;
			ret *= a[i];
		}
		cout << ret << endl;
	}
	return 0;
}