#include <bits/stdc++.h>

using namespace std;

void fast_io() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}

int main() {
    fast_io();
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    if (n >= 16) {
        cout << (1 << 16) - 1 << endl;
        return 0;
    }
    vector<vector<bool>> dp(n + 1, vector<bool>(1 << 16));
    dp[0][0] = true;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < 1 << 16; j++) {
            if (dp[i][j]) {
                int num = a[i];
                for (int _ = 0; _ < 16; _++) {
                    dp[i + 1][j | num] = true;
                    num = num / 2 + (num % 2) * (1 << 15);
                }
            }
        }
    }
    for (int i = (1 << 16) - 1; i >= 0; i--) {
        if (dp[n][i]) {
            cout << i << endl;
            return 0;
        }
    }
}