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/*  AUTHOR  :   DHRUVIL KAKADIYA
    DATE    :   20-02-2022
*/

#include <bits/stdc++.h>
using namespace std;
#define vi vector<int>
#define vii vector<pair<int, int>>
#define pi pair<int, int>
#define f(i, x, n) for (int i = x; i < n; i++)
#define float double
#define ll long long int
void solve()
{
    int n;
    cin >> n;
    ll a[n];
    f(i, 0, n)
            cin>>a[i];
    f(i, 0, n)
        a[0] |= a[i];
    cout << a[0] << endl;
}
int main()
{

    int t;
    cin >> t;
    while (t--)
        solve();
    return 0;
}