#include <bits/stdc++.h>

using namespace std;

const int N = 2e5 + 10;

int n, a[N];

vector<int> sub[N];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    cin >> n;
    for(int i = 1, x; i <= n; i ++) {
        cin >> x;
        a[x] ++;
    }

    long long ans = 0, mod = 0;

    for(int i = 1; i < N; i ++) {
        for(int j = i; j < N; j += i)
            sub[j].push_back(i);
        for(auto x : sub[i])
            mod += x * (long long)a[x];
        
        ans += a[i] * ((long long)i * n - mod);
    }
    cout << ans;
}