#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll
int n,x,a[2],b[2];
signed main(){
	
    cin >> n >> x;
    a[0] = a[1] = x;
	for (int i = 1; i < n; i ++){
        cin >> x;
        b[0] = -1e18, b[1] = 1e18;
        b[0] = max({b[0], a[0] + x, a[0] - x, a[0] * x, a[1] + x, a[1] - x, a[1] * x});
        b[1] = min({b[1], a[0] + x, a[0] - x, a[0] * x, a[1] + x, a[1] - x, a[1] * x});
        if (x)
        {
            b[0] = max({b[0], a[0] / x, a[1] / x});
            b[1] = min({b[1], a[0] / x, a[1] / x});
        }
        a[0] = b[0];
        a[1] = b[1];
    }
    cout << max(a[0], a[1]);
}