// ConsoleApplication7.cpp : Defines the entry point for the console application.
//

#include "iostream"
#include "vector"
#include "algorithm"
using namespace std;
typedef long long i64;

int main()
{
	int n;
	scanf("%d", &n);
	vector<int> a(n);
	for (int i = 0; i < n; ++i) {
		scanf("%d", &a[i]);
	}
	i64 INF = 1;
	for (int i = 0; i < n; ++i) {
		INF =INF* 9;
	}
	++INF;
	vector<i64> dpMax(n, -INF);
	vector<i64> dpMin(n, INF);
	dpMax[0] = a[0];
	dpMin[0] = a[0];
	for (int i = 1; i < n; ++i) {
		for (i64 u : {dpMax[i - 1], dpMin[i - 1]}) {
			int v = a[i];
			dpMax[i] = max(dpMax[i], u + v);
			dpMax[i] = max(dpMax[i], u - v);
			dpMax[i] = max(dpMax[i], u*v);
			dpMin[i] = min(dpMin[i], u + v);
			dpMin[i] = min(dpMin[i], u - v);
			dpMin[i] = min(dpMin[i], u*v);
			if (v != 0) {
				dpMax[i] = max(dpMax[i], u / v);
				dpMin[i] = min(dpMin[i], u / v);
			}
		}
		dpMax[i] = min(dpMax[i], INF);
		dpMin[i] = max(dpMin[i], -INF);
	}
	printf("%lld", dpMax[n - 1]);

	return 0;
}