#include <bits/stdc++.h>
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
  std::cout << name << " : " << arg1 << '\n';
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
  const char* comma = strchr(names + 1, ',');
  std::cout.write(names, comma - names) << " : " << arg1 << " | ";
  __f(comma + 1, args...);
}
using namespace std;
long long int sumXOR(long long arr[], long long n) {
  long long int sum = 0;
  for (int i = 0; i < 32; i++) {
    int zc = 0, oc = 0;
    long long int idsum = 0;
    for (int j = 0; j < n; j++) {
      if (arr[j] % 2 == 0)
        zc++;
      else
        oc++;
      arr[j] /= 2;
    }
    idsum = oc * zc * (1 << i);
    sum += idsum;
  }
  return sum;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long i, j, n, m, k, cnt = 0, ans = 0, t = 1;
  cin >> n;
  long long a[n];
  for (i = 0; i < n; i++) cin >> a[i];
  return cout << sumXOR(a, n), 0;
  return 0;
}
