//7000.rpm
#include <bits/stdc++.h>
using namespace std;
#define int long long int
void solve() {
int n;
cin>>n;
vector<int>vec(n);
for(int i=0;i<n;i++){
cin>>vec[i];
}
sort(vec.begin(),vec.end());
int multi(1);
for(int i=0;i<n;i++){
if(i==0){
continue;
}
else{
multi*=vec[i];
}
}
int mn = vec[0];
++mn;
cout<<mn*multi<<endl;
}
signed main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
int tt;
cin >> tt;
for(int i=0;i<tt;i++){
solve();
}
return 0;
}
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