t = int(input())
for _ in range(t):
n = int(input())
lis = list(map(int, input().split()))
ans = 0
for i in lis:
ans |= i
print(ans)#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define ios ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
//const ll mod = 1e9 + 9;
const ll len = 4e7 + 1;
//const ll len1 = 1e8;
#define pb push_back
int a[100010];
void sol() {
ll i, j = 0, n, ans = 0, k = 0, m, p, q, w, e, r;
cin >> n;
for (i = 0; i < n; i++) {
cin >> q;
k |= q;
}
cout << k << "\n";
}
int main() {
//#pragma comment(linker, "/STACK:1073741824")
//#pragma warning(disable : 4996)
ios;
int n;
cin >> n;
for (int i = 0; i < n; i++) {
sol();
}
return 0;
}80A - Panoramix's Prediction | 1354B - Ternary String |
122B - Lucky Substring | 266B - Queue at the School |
1490A - Dense Array | 1650B - DIV + MOD |
1549B - Gregor and the Pawn Game | 553A - Kyoya and Colored Balls |
1364A - XXXXX | 1499B - Binary Removals |
1569C - Jury Meeting | 108A - Palindromic Times |
46A - Ball Game | 114A - Cifera |
776A - A Serial Killer | 25B - Phone numbers |
1633C - Kill the Monster | 1611A - Make Even |
1030B - Vasya and Cornfield | 1631A - Min Max Swap |
1296B - Food Buying | 133A - HQ9+ |
1650D - Twist the Permutation | 1209A - Paint the Numbers |
1234A - Equalize Prices Again | 1613A - Long Comparison |
1624B - Make AP | 660B - Seating On Bus |
405A - Gravity Flip | 499B - Lecture |