#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vll = vector<int>;
#define all(A) A.begin(),A.end()
#define rep(i, n) for (ll i = 0; i < (ll) (n); i++)
int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int M = 2e5 + 1;
    int N;
    cin >> N;
    vector<bool> R(M + 1, 0);
    vll A(N);
    rep(i, N) {
        cin >> A[i];
        R[A[i]] = 1;
    }
    ll an = 0;
    vll SR(M + 2, 0), SN(M + 2, 0);
    for (int m = M; m > 0; m--) {
        SR[m] = SR[m + 1];
        SN[m] = SN[m + 1];
        if (R[m]) {
            an += ll(m) * SN[m + 1];
            for (int j = m; j <= M; j += m) {
                int nj = min(j + m, M + 1);
                int s = SR[j] - SR[nj];
                int n = SN[j] - SN[nj];
                ll p = ll(j) * n;
                an -= (s - p);
            }
            SR[m] += m;
            SN[m] += 1;
        }
    }
    cout << an << endl;


}