#include <bits/stdc++.h>
using namespace std;
int main () {
    int N;
    cin >> N;
    int ans = 0;
    for (int i = 0; i < N; i ++) {
        int a;
        cin >> a;
        int kj = ans;
        for (int j =  0; j < 16; j ++) {
            ans = max(ans, kj | a);
            a = (a >> 1) | ((a & 1) << 15);
        }
    }
    cout << ans << endl;
}