#include<iostream>
#include<cstdio>
#define N 1000000
using namespace std;
long long read()
{
	char c=0;
	long long sum=0;
	while (c<'0'||c>'9') c=getchar();
	while ('0'<=c&&c<='9') sum=sum*10+c-'0',c=getchar();
	return sum;
}
int n,top;
long long dque[N+1],a[N+1],ans;
int main()
{
	n=read();
	for (int i=1;i<=n;++i)
	{
		a[i]=read();
		while (top>=2&&(dque[top-1]&dque[top])+(dque[top]&a[i])<=(dque[top-1]&a[i])) top--;
		dque[++top]=a[i];
	}
	for (int i=1;i<=top-1;++i) ans+=(dque[i]&dque[i+1]);
	printf("%lld\n",ans);
	return 0;
}