// what is matter? never mind.
#include<bits/stdc++.h>
#define For(i,a,b) for(int i=(a);i<=(b);++i)
#define Rep(i,a,b) for(int i=(a);i>=(b);--i)
#define int long long
using namespace std;
inline int read()
{
    char c=getchar();int x=0;bool f=0;
    for(;!isdigit(c);c=getchar())f^=!(c^45);
    for(;isdigit(c);c=getchar())x=(x<<1)+(x<<3)+(c^48);
    if(f)x=-x;return x;
}

#define fi first
#define se second
#define pb push_back
#define mkp make_pair
typedef pair<int,int>pii;
typedef vector<int>vi;

#define maxn 500005
#define inf 0x3f3f3f3f

int n,a[maxn],res,sum;

int bs[66];
void ins(int x){
	For(i,0,60)
		if(x>>i&1){
			if(!bs[i])return bs[i]=x,void();
			x^=bs[i];
		}
}

bool chk(int i){
	int x=(1ll<<i)-1;
	For(j,0,i)
		if(x>>j&1){
			if(!bs[j])return 0;
			x^=bs[j];	
		}
	return 1;
}

signed main()
{
	n=read();
	For(i,1,n)a[i]=read(),ins(a[i]),sum^=a[i];
	For(i,1,60)
		if(chk(i)) res=max(res,sum^((1ll<<(i+1))-1));
	cout<<res;
	return 0;
}