#include <atcoder/all>
#include <iostream> // cout, endl, cin
#include <string> // string, to_string, stoi
#include <vector> // vector
#include <algorithm> // min, max, swap, sort, reverse, lower_bound, upper_bound
#include <utility> // pair, make_pair
#include <tuple> // tuple, make_tuple
#include <cstdint> // int64_t, int*_t
#include <cstdio> // printf
#include <map> // map
#include <queue> // queue, priority_queue
#include <set> // set
#include <stack> // stack
#include <deque> // deque
#include <unordered_map> // unordered_map
#include <unordered_set> // unordered_set
#include <bitset> // bitset
#include <cctype> // isupper, islower, isdigit, toupper, tolower
#include <math.h>
#include <iomanip>
using namespace std;  
using namespace atcoder;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repi(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
typedef long long ll;
typedef unsigned long long ull;
const ll inf=1e18+1;  
using graph = vector<vector<int> > ;
using P= pair<ll,ll>;  
using vi=vector<int>;
using vvi=vector<vi>;
using vll=vector<ll>; 
using vvll=vector<vll>;
using vp=vector<P>;
using vpp=vector<vp>;
//string T="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
//string S="abcdefghijklmnopqrstuvwxyz";
//g++ main.cpp -std=c++14 -I .  
//cout <<setprecision(20);
//cout << fixed << setprecision(10);
//cin.tie(0); ios::sync_with_stdio(false);
const double PI = acos(-1);

int main(){cin.tie(0); ios::sync_with_stdio(false);
  int n; cin >> n;
  vi a(n);rep(i,n)cin >> a[i];
  ll Bit=1ll<<16;
  if(n>=16){
    ll ans=Bit-1;
    cout << ans << endl;
    return 0;
  }
  auto f=[&](int i){
    return i/2+(1<<15)*(i&1);
  };
  vvi dp(n+1,vi(Bit));
  dp[0][0]=1;
  rep(i,n)rep(j,Bit){
    rep(k,17){
      a[i]=f(a[i]);
      int nj=j|a[i];
      dp[i+1][nj]|=dp[i][j];
    }
  }
  int ans=0;
  rep(i,Bit)if(dp[n][i])ans=i;
  cout << ans << endl;
  
}