#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr ll LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 1000000007;
// constexpr int MOD = 998244353;
constexpr int dy[] = {1, 0, -1, 0}, dx[] = {0, -1, 0, 1};
constexpr int dy8[] = {1, 1, 0, -1, -1, -1, 0, 1}, dx8[] = {0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U> inline bool chmax(T &a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U> inline bool chmin(T &a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    cout << fixed << setprecision(20);
  }
} iosetup;

int main() {
  int n; cin >> n;
  map<int, int> a;
  ll ans = 0;
  REP(_, n) {
    int ai; cin >> ai;
    ans += 1LL * ai * n;
    ++a[ai];
  }
  int m = a.size();
  vector<int> val(m), cnt(m);
  auto it = a.begin();
  for (int i = 0; i < m; ++i, ++it) tie(val[i], cnt[i]) = *it;
  vector<int> sum(m + 1, 0);
  REP(i, m) sum[i + 1] = sum[i] + cnt[i];
  REP(i, m) {
    ans -= 1LL * val[i] * cnt[i] * cnt[i];
    int cur = i + 1;
    for (int l = val[i], mul = 1; cur < m; l += val[i], ++mul) {
      int nxt = lower_bound(val.begin() + cur, val.end(), l + val[i]) - val.begin();
      ans -= 1LL * (sum[nxt] - sum[cur]) * val[i] * mul;
      cur = nxt;
    }
  }
  cout << ans << '\n';
  return 0;
}