#include <iostream>
using namespace std;
int main(void){
    int n, a[100];
    cin >> n;
    for(int i=0; i<n; i++){
        cin >> a[i];
    }
    long long sum;
    long long ma = max(max(a[0]*a[1],a[0]+a[1]), a[0]-a[1]);
    long long mi = min(min(a[0]*a[1],a[0]+a[1]), a[0]-a[1]);
    for(int i=2; i<n; i++){
        ma = max(max(max(ma*a[i],ma+a[i]), ma-a[i]), max(max(mi*a[i],mi+a[i]), mi-a[i]));
        mi = min(min(min(ma*a[i],ma+a[i]), ma-a[i]), min(min(mi*a[i],mi+a[i]), mi-a[i]));
    }
    cout << max(ma, mi) << endl;
    return 0;
}