#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';
}
}
}
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