//#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
#include <iostream>
#include <algorithm>
using namespace std;
using ll = long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using vi = vector<int>;  using vvi = vector<vi>;
using vl = vector<ll>;   using vvl = vector<vl>;
using vb = vector<bool>; using vvb = vector<vb>;
using vpi = vector<pii>; using vvpi = vector<vpi>;
using vpl = vector<pll>; using vvpl = vector<vpl>;
const int inf = 1 << 30;
const ll INF = 1LL << 60;
#define rep(i,m,n) for (int i = m; i < (int)(n); i++)
#define rrep(i,m,n) for (int i = m; i > (int)(n); i--)

int main(){
    int n; cin >> n;
    vl A(n);
    rep(i,0,n){
        cin >> A[i];
    }
    rep(i,0,62){
        bool tf = true;
        rep(j,0,n){
            if (A[j]>>i & 1){
                tf = false;
                break;
            }
        }
        if (tf){
            ll ans = 1LL << i;
            cout << ans << endl;
            return 0;
        }
    }
}