#include <iostream>
#include <cstring>
#include <cstdio>
#include <cassert>
#include <cstdlib>

using namespace std;

int main()
{
    int t, n, x, ans;

    freopen("inp_x.txt", "r", stdin);
    freopen("out_x.txt", "w", stdout);

    cin >> t;
    assert(t >= 1 && t <= 10);

    while ( t-- ) {

        cin >> n;
        assert(n >= 1 && n <= 100000);

        ans = 0;

        for ( int i = 0; i < n; i++ ) {
            cin >> x;
            assert(x >= 0 && x <= 1000000000);
            ans |= x;
        }

        cout << ans << endl;
    }

    return 0;
}