#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
#define fix(x) fixed << setprecision(x)
#define asc(x) x, vector<x>, greater<x>
#define rep(i, n) for(ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;}
const int MAX = 200000;
int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    vector<ll> cnt(200200,0), tot(200200,0), sum(200200,0);
    rep(i,n){
        ll a;
        cin >> a;
        cnt[a]++, tot[a]++;
        sum[a] += a;
    }
    rep(i,MAX) tot[i+1] += tot[i], sum[i+1] += sum[i];
    ll ans = 0;
    for(int i=1;i<=MAX;i++){
        ans += (tot[MAX] - tot[i])*cnt[i] * i;
        for(int j=2;;j++){
            int x = min(i*j-1, MAX), y = i*(j-1);
            ll z = sum[x]-sum[y] - (tot[x]-tot[y])*y;
            z *= cnt[i];
            ans -= z;
            if(x==MAX) break;
        }
    }
    cout << ans << '\n';
    return 0;
}