#include using namespace std; #define inf INT_MAX #define INF LLONG_MAX #define ll long long #define ull unsigned long long #define M (int)(1e9+7) #define P pair #define PLL pair #define FOR(i,m,n) for(int i=(int)m;i<(int)n;i++) #define RFOR(i,m,n) for(int i=(int)m;i>=(int)n;i--) #define rep(i,n) FOR(i,0,n) #define rrep(i,n) RFOR(i,n,0) #define all(a) a.begin(),a.end() #define IN(a,n) rep(i,n){ cin>>a[i]; } const int vx[4] = {0,1,0,-1}; const int vy[4] = {1,0,-1,0}; #define PI 3.14159265 #define F first #define S second #define PB push_back #define EB emplace_back #define int ll #define vi vector signed main(){ cin.tie(0); ios::sync_with_stdio(false); int n; cin>>n; vi a(n); rep(i,n){ cin>>a[i]; } queue q; set s; q.push(0); while(!q.empty()){ int x=q.front(); q.pop(); s.insert(x); rep(i,n){ int y=x^a[i]; if(s.find(y)==s.end()){ q.push(y); } } } cout<