// 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]);
	}
	vector<i64> dp(n, -(1LL << 62));
	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]);
	}
	printf("%d",dp[n - 1]);

	return 0;
}