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

void solve(){
    int n; cin >> n;
    ll ans = 1;
    ll x; cin >> x;
    while (--n) {
        cin >> x;
        ll m = stoll("1" + string(to_string(x).size(), '0'));
        ans = lcm(ans, m / gcd(m, x));
    }
    cout << ans << '\n';
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int T; cin >> T;
    while (T--) solve();
}