#include<bits/stdc++.h>
#define int unsigned long long
#define maxn 1000005
using namespace std;
namespace IO{
	inline int read(){
		int x=0,f=1;
		char ch=getchar();
		while(ch<'0'||ch>'9'){
			if(ch=='-')f=-1;
			ch=getchar();
		}
		while(ch>='0'&&ch<='9')x=x*10+ch-'0',ch=getchar();
		return x*f;
	}
	inline void write(int x){
		if(x<0){putchar('-');x=-x;}
		if(x>=10)write(x/10);
		putchar(x%10+'0');return;
	}
}
using namespace IO;
int n,a[maxn],dp[maxn],ans,res[32];
signed main(){
//	freopen("rose.in","r",stdin);
//	freopen("rose.out","w",stdout);
	n=read();
	for(int i=1;i<=n;++i)a[i]=read();
	for(int i=1;i<=n;++i){
		for(int j=0;j<=31;++j)
			dp[i]=max(dp[i],dp[res[j]]+(a[i]&a[res[j]]));
		for(int j=0;j<=31;++j){
			if(a[i]&(1ull<<j))
				res[j]=i;
		}
		ans=max(ans,dp[i]);
	}
	
	write(ans);
	return 0;
}