#include <iostream>
using namespace std;
typedef long long ll;

const int M = 200000;

int main()
{
    int n;
    cin >> n;
    bool b[200005]{0};
    int d[200005]{0};
    for (int i = 0; i < n; i++)
    {
        int a;
        cin >> a;
        b[a] = true;
        d[a] = a;
    }
    ll c[200005], s[200005];
    c[0] = s[0] = 0;
    for (int i = 1; i <= M + 1; i++)
    {
        c[i] = c[i - 1] + b[i - 1];
        s[i] = s[i - 1] + d[i - 1];
    }
    ll ans = 0;
    int e = 0;
    for (int i = 1; i <= M; i++)
    {
        if (b[i])
        {
            ans += i * (n - e - 1);
            e++;
        }
    }
    for (int i = M; i > 0; i--)
    {
        if (!b[i])
        {
            continue;
        }
        int r = i;
        for (int j = 2; j * j <= i; j++)
        {
            int l = i / j + 1;
            ans -= -(s[r] - s[l]) * (j - 1) + (c[r] - c[l]) * (i % l + l * (j - 1));
            r = l;
        }
        for (int j = 1; j < r; j++)
        {
            if (b[j])
            {
                ans -= i % j;
            }
        }
    }
    cout << ans << endl;
}