#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
	vector<ll> pow10(1, 1);
	for(int i = 0; i < 10; i++) pow10.emplace_back(pow10.back() * 10);
	ios::sync_with_stdio(false);
	cin.tie(0);
	int T;
	cin >> T;
	while(T--){
		int n;
		ll ans = 1;
		cin >> n;
		for(int i = 0, v; i < n; i++){
			cin >> v;
			if(v == 0 || i == 0) continue;
			ll b = *upper_bound(pow10.begin(), pow10.end(), v);
			ll g = gcd(v, b);
			ans = lcm(ans, b / g);
		}
		cout << ans << '\n';
	}
}