#include <bits/stdc++.h>
using namespace std;

int main(){
  int n;
  cin >> n;
  int arr[n];
  for(int i = 0; i < n; i++){
    int t;
    cin >> t;
    arr[i] = t;
  }
  for(int i = 1; i < n; i++){
    long t1 = arr[i]^arr[i-1];
    sum = sum + t1;
  }
  cout << sum % 1000000007;
}