#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
// using namespace atcoder;
// using mint = modint1000000007;
// const int mod = 1000000007;
// using mint = modint998244353;
// const int mod = 998244353;
// const int INF = 1e9;
// const long long LINF = 1e18;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i, l, r) for (int i = (l); i < (r); ++i)
#define rrep(i, n) for (int i = (n)-1; i >= 0; --i)
#define rrep2(i, l, r) for (int i = (r)-1; i >= (l); --i)
#define all(x) (x).begin(), (x).end()
#define allR(x) (x).rbegin(), (x).rend()
#define P pair<int, int>
template<typename A, typename B> inline bool chmax(A &a, const B &b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A &a, const B &b) { if (a > b) { a = b; return true; } return false; }

int main() {
	std::ios::sync_with_stdio(false);
	std::cin.tie(nullptr);
	int t; cin >> t;
	while (t--) {
		int n; cin >> n;
		int c2 = 0, c5 = 0;
		vector<long long>a(n);
		rep(i, n) {
			cin >> a[i];
			if (i == 0)continue;
			if (a[i] == 0)continue;
			while (a[i] % 10 == 0) {
				a[i] /= 10;
			}
			int sz = to_string(a[i]).size();
			auto ca = a[i];
			int c22 = sz, c52 = sz;
			while (ca % 5 == 0) {
				c52--;
				ca /= 5;
			}
			while (ca % 2 == 0) {
				c22--;
				ca /= 2;
			}
			chmax(c2, c22);
			chmax(c5, c52);
		}
		long long ans = 1;
		rep(i, c2)ans *= 2;
		rep(i, c5)ans *= 5;
		cout << ans << endl;
	}
	return 0;
}