#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic pop
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  VI a(n);
  rep(i, n) cin >> a[i];
  if (n >= 16) {
    cout << (1 << 16) - 1 << '\n';
    return 0;
  }
  vector<char> dp(1 << 16), ndp;
  dp[0] = 1;
  for(int x: a) {
    ndp.assign(1 << 16, false);
    rep(i, 1 << 16) if (dp[i]) {
      rep(_, 16) {
        ndp[i | x] = true;
        x = (x >> 1) | (x & 1) << 15;
      }
    }
    swap(dp, ndp);
  }
  int ans = (1 << 16) - 1;
  while(!dp[ans]) ans--;
  cout << ans << '\n';
}