#include <iostream>
#include <vector>
#include <algorithm>

int main() {
	int n;
	std::cin >> n;

	long long min = 0;
	long long max = 0;

	for (int i = 0; i < n; i++) {
		int a;
		std::cin >> a;

		long long min0 = min;
		long long max0 = max;

		min = std::min({ min0 + a, min0 - a, min0 * a, max0 * a });
		max = std::max({ max0 + a, max0 - a, min0 * a, max0 * a });
	}

	std::cout << max << std::endl;
}