#include <iostream>
using namespace std;

int main(){
    int t; cin >> t;

    while(t --){
        int n; cin >> n;
        int zero = 0;
        int sum = 1;
        int mn = 9;
        for(int i = 1; i <= n; i ++){
            int x; cin >> x;
            if(x == 0) zero ++;
            if(x != 0) sum *= x;
            if(mn > x) mn = x;
        }
        if(zero >= 2){
            cout << 0 << '\n';
        }
        else if(zero == 1){
            cout << sum << '\n';
        }
        else{
            sum /= mn;
            mn ++;
            sum *= mn;
            cout << sum << '\n';
        }

    }
}