#include using namespace std; using ll = int64_t; #define rep(i, s, e) for (int i = s; i < e; ++i) #define sort_(a) stable_sort(a.begin(), a.end()) #define rsort(a) stable_sort(a.rbegin(), a.rend()) #define join(a, d) accumulate(a.begin() + 1, a.end(), a[0], [](string s, string t) { return s + d + t; }) constexpr ll sum(auto a) { return accumulate(a.begin(), a.end(), 0LL); } constexpr double degrees(double a) { return a * 180.0 / M_PI; } constexpr double radians(double a) { return (a * M_PI) / 180.0; } constexpr long mod = 1e9 + 7; int main(int, [[maybe_unused]] char *argv[]) { #ifdef DEBUG freopen(argv[1], "r", stdin); #endif ios_base::sync_with_stdio(false); cin.tie(0); cout << fixed << setprecision(15); int N; cin >> N; vector B(N); rep(i, 0, N) cin >> B[i]; int ans = 0; rep(i, 0, N) { ans |= B[i]; } cout << ans << endl; return 0; }