#pragma region Macros // #pragma GCC target("avx2") #pragma GCC optimize("O3") #include <bits/stdc++.h> #include <atcoder/all> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> using namespace std; using namespace __gnu_pbds; template <typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; struct __INIT{__INIT(){cin.tie(0);ios::sync_with_stdio(false);cout<<fixed<<setprecision(15);}} __init; #define rep(i, n) for (long long i = 0; i < (n); i++) #define rrep(i, n) for (long long i = (n - 1); i >= 0; i--) #define ALL(v) v.begin(), v.end() #define endl "\n" #define fi first #define se second #define popcount(bit) __builtin_popcount(bit) #define popcountll(bit) __builtin_popcountll(bit) #define pb push_back #define eb emplace_back using namespace atcoder; using P = pair<int, int>; using PL = pair<long long, long long>; using Graph = vector<vector<int>>; typedef long long ll; template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; } template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; } const int dx[4] = {1, 0, -1, 0}; const int dy[4] = {0, 1, 0, -1}; const int fx[8] = {0, 1, 1, 1, 0, -1, -1, -1}; const int fy[8] = {1, 1, 0, -1, -1, -1, 0, 1}; template <typename T> const auto INF = numeric_limits<T>::max()/2; int main() { int n; cin >> n; vector<ll> A(n); rep(i, n) cin >> A[i]; vector<int> cn(62); rep(i, 62)rep(j, n){ if(A[j] & (1LL << i)){ cn[i]++; } } rep(i, 62){ if(cn[i] == 0){ cout << (1LL << i) << endl; return 0; } } }