B

#include <bits/stdc++.h>

using namespace std;

int main() {
    int t;
    cin>>t;

    while(t--){
        int n;
        cin>>n;

        vector<int> a(n);
        for(auto &e: a)     cin>>e;

        long long int ans = 0;

        for(auto e: a)
            ans = ((ans+e)/e)*e;

        cout<<ans<<"\n";
    }
}