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

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, v, r = 200000;
    cin >> n;
    vector<int> a(n);
    vector<ll> cnt(r + 2), s(r + 2);
    for(int i = 0; i < n; i++){
        cin >> v;
        cnt[v + 1]++;
        s[v + 1] += v;
    }
    for(int i = 0; i <= r; i++){
        cnt[i + 1] += cnt[i];
        s[i + 1] += s[i];
    }
    ll ans = 0;
    for(int i = 1; i <= r; i++){
        if(cnt[i + 1] == cnt[i])continue;
        ans += (cnt[r + 1] - cnt[i + 1]) * i;
        for(int j = i; j <= r; j+=i){
            ans -= s[min(r + 1, j + i)] - s[j] - (cnt[min(r + 1, j + i)] - cnt[j]) * j;
        }
    }
    cout << ans << '\n';
}