#include<iostream>
#include<fstream>
#include<bitset>
#include<vector>
#include<deque>
#include<map>
#include<set>
#include<queue>
#include<string>
#include<algorithm>
#include<cmath>
#include<ctime>
#include<cstdio>
using namespace std;
#if defined wolf
const string ok="OK";
const string kk="	";
ofstream nnew("superbull.in",ios::app);
ifstream fin("superbull.in");
#define fout cout
#define Endl endl
#else
ifstream fin("superbull.in");
ofstream fout("superbull.out");
#endif
class node{
public:
	int n,dis;
	node(){
	}
	node(int a,int b){
		n=a;
		dis=b;
	}
	bool operator < (const node & x)const{
		return dis<x.dis;
	}
};
const int IMAX=999999999;
vector<int> TT;
//vector<vector<int> > num;
/*void build(int n){
	num.resize(n);
	for(int i=0;i!=TT.size();++i){
		num[i].resize(n,0);
		for(int j=0;j!=TT.size();++j){
			num[i][j]=TT[i]^TT[j];
		}
	}
}*/
long long core(int n){
	long long ans=0;
	vector<int> dis;
	vector<bool> ll;
	vector<int> path;
	path.resize(n,0);
	ll.resize(n,0);
	dis.resize(n,0);
	priority_queue<node> Q;
	Q.push(node(0,0));
	while(!Q.empty()){
		node it;
		it=Q.top();
		Q.pop();
		if(ll[it.n]){
			continue;
		}
		ll[it.n]=1;
		//cout<<TT[it.n]<<endl;
		///////////////////
		for(int i=0;i!=n;++i){//TT[it.n]^TT[i]
			if(dis[i]<dis[it.n]+(TT[it.n]^TT[i])&&ll[i]!=1){
				//cout<<TT[it.n]<<kk<<TT[i]<<kk<<(TT[it.n]^TT[i])<<kk<<dis[it.n]+(TT[it.n]^TT[i])<<endl;
				dis[i]=dis[it.n]+(TT[it.n]^TT[i]);
				path[i]=it.n;
				Q.push(node(i,dis[i]));
			}
		}
	}
	for(int i=1;i!=path.size();++i){
		///cout<<TT[i]<<kk;TT[path[i]]^TT[i]
		ans+=(TT[path[i]]^TT[i]);
	}
	//cout<<endl;
	/*for(int i=1;i!=path.size();++i){
		cout<<TT[path[i]]<<kk;
	}*/
	return ans;
}
int main(){
	int n;
	fin>>n;
	for(int i=0;i!=n;++i){
		int e;
		fin>>e;
		TT.push_back(e);
	}
	//build(n);
	/*for(int i=0;i!=n;++i){
		for(int j=0;j!=n;++j){
			cout<<num[i][j]<<kk;
		}
		cout<<endl;
	}*/
	fout<<core(n)<<endl;
	//-------------------------*/
	#if defined wolf
	cout<<endl<<(double)clock()/CLOCKS_PER_SEC<<'s'<<endl;
	#endif
	return 0;
}
//Designed by wolf
//Mon Apr 20 2015