#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, ma, mi;
    if(a[1] != 0){
        ma = max(max(max(a[0]*a[1],a[0]+a[1]), a[0]-a[1]),a[0]/a[1]);
        mi = min(min(min(a[0]*a[1],a[0]+a[1]), a[0]-a[1]), a[0]/a[1]);
    }else{
        ma = max(max(a[0]*a[1],a[0]+a[1]), a[0]-a[1]);
        mi = min(min(a[0]*a[1],a[0]+a[1]), a[0]-a[1]);
    }
    long long tmp_ma, tmp_mi;
    for(int i=2; i<n; i++){
        if(a[i] != 0){
            tmp_ma = max(max(max(max(ma*a[i],ma+a[i]), ma-a[i]),ma/a[i]), max(max(max(mi*a[i],mi+a[i]), mi-a[i]),mi/a[i]));
            tmp_mi = min(min(min(min(ma*a[i],ma+a[i]), ma-a[i]),ma/a[i]), min(min(min(mi*a[i],mi+a[i]), mi-a[i]),mi/a[i]));
        }else{
            tmp_ma = max(max(max(ma*a[i],ma+a[i]), ma-a[i]), max(max(mi*a[i],mi+a[i]), mi-a[i]));
            tmp_mi = min(min(min(ma*a[i],ma+a[i]), ma-a[i]), min(min(mi*a[i],mi+a[i]), mi-a[i]));
        }
        ma = tmp_ma;
        mi = tmp_mi;
    }
    cout << max(ma, mi) << endl;
    return 0;
}