#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <bitset>
#include <atcoder/modint>

using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)

using Modint = atcoder::static_modint<998244353>;


int main(){
    int N; cin >> N;
    if(N >= 16){ cout << ((1<<16)-1) << '\n'; return 0; }
    vector<int> A(N);
    rep(i,N) cin >> A[i];
    vector<bool> dp(1<<16);
    dp[0] = true;
    for(int a : A){
        vector<bool> tmp(1<<16);
        rep(q,16){
            a = (a>>1) | ((a%2)<<15);
            rep(i,1<<16) if(dp[i]) tmp[i|a] = true;
        }
        swap(dp,tmp);
    }
    int ans = 0;
    rep(i,1<<16) if(dp[i]) ans = i;
    cout << ans << '\n';
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;