#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N=2e5+10;
int a[N],d[N],f[N],s[N],n;
signed main()
{
	cin>>n;
	for(int i=1;i<=n;i++)cin>>a[i];
	int ans=0;
	for(int i=30;i>=0;i--)
	{
		for(int j=1;j<=n;j++)d[j]=bool(a[j]&(1<<i));
		for(int j=1;j<=n;j++)f[j]=f[j-1]^d[j];
		for(int j=1;j<=n;j++)s[j]=s[j-1]+f[j];
		int res=0;
		for(int j=2;j<=n;j++)
			if(f[j])res+=j-1-s[j-2];
			else res+=s[j-2];
		ans+=res<<i;
	}
	cout<<ans;
	return 0;
}