#include <bits/stdc++.h>
using namespace std;

int main()
{
  int N;
  long long tmp_or,tmp_xor,ans;
  cin >> N;
  vector<long long> A(N);
  for (int i = 0; i < N; i++) cin >> A.at(i);
  ans = pow(2,32);
  for (int bit = 0; bit < (1<<(N-1)); bit++)
  {
    tmp_or = 0, tmp_xor = 0;
    for (int i = 0; i < N; i++)
    {
      if (i == 0)
        tmp_or = A.at(i);
      else
      {
        if (bit & (1<<(i-1)))
        {
          tmp_xor ^= tmp_or;
          tmp_or = A.at(i);
        }
        else
          tmp_or |= A.at(i);
      }
    }
    tmp_xor ^= tmp_or;
    if (ans > tmp_xor)
      ans = tmp_xor;
  }
  cout << ans << endl;
}

#include <bits/stdc++.h>
#include <chrono>

using namespace std;
using namespace chrono;

typedef long long int ll;
typedef vector<int> vii;
typedef vector<ll> vll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define pb push_back
#define odd(x) ((x)&1)
#define even(x) (!odd(x))
#define all(v) (v).begin(),(v).end()
#define rep(i,n) for(auto i=0;i<n;++i)
#define FASTIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define TEST_CASE int tc;cin>>tc;while(tc--)
#define Clock high_resolution_clock::now()

template<class T>
inline bool chmax(T &a, T b) {if(a < b) {a = b;return true;}return false;}
template<class T>
inline bool chmin(T &a, T b) {if(a > b) {a = b;return true;}return false;}

#ifdef LOCAL
#define cerr cout
#else
#endif

#define TRACE

#ifdef TRACE
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1>
void __f(const char* name, Arg1&& arg1){
    cerr << name << " : " << arg1 << std::endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args){
    const char* comma = strchr(names + 1, ',');cerr.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...);
}
#else
#define trace(...)
#endif


void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}


template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
// #define TIME

/******************************************************************************************************************************/


const ll inf = 2e18;
const ll mod = 998244353;
const ll N = 1e7+3;


int main()
{
    auto start_time = Clock;
    FASTIO

    
    int n;
    cin >> n;
    if(n%100 == 0) cout << n/100;
    else {
        cout << (n/100 + 1);
    }

    


    auto end_time = Clock;
    #ifndef TIME
        return 0;
    #endif
    cout << "\nTime elapsed: "
    << (double)duration_cast<milliseconds>(end_time-start_time).count() 
    << "ms";


    return 0;
}