#include <bits/stdc++.h>
using namespace std;
#define maxn 60
#define ll long long
ll n,a[maxn],P[maxn];

inline void init_() {
	freopen("a.txt","r",stdin);
}

inline ll read_() {
	ll x=0,f=1;
	char c=getchar();
	while(c<'0'||c>'9') {
		if(c=='-') f=-1;
		c=getchar();
	}
	while(c>='0'&&c<='9') {
		x=x*10+c-'0';
		c=getchar();
	}
	return x*f;
}

inline void readda_() {
	n=read_();
	for(int i=1;i<=n;i++) {
		a[i]=read_();
	}
}

inline void work_() {
	for(int i=1;i<=n;i++) {
		for(int j=52;j>=0;j--) {
			if(!(a[i]>>j)) continue;
			if(!P[j]) {
				P[j]=a[i];
				break;
			}
			else a[i]^=P[j];
		}
	}
	ll ans=0;
	for(int i=52;i>=0;i--) {
		if((ans^P[i])>ans) ans=ans^P[i];
	}
	printf("%lld",ans);
}

int main() {
	init_();
	readda_();
	work_();
	return 0;
}