#include <bits/stdc++.h>

using namespace std;

using ll = long long;

constexpr char newl = '\n';

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

    int n;
    cin >> n;

    vector<ll> cnt(200010, 0);
    for (int i = 0; i < n; i++) {
        int a;
        cin >> a;
        ++cnt[a];
    }

    // 0 1 2 3 0 0 0 0
    // 0 1 1 1 -3 0 0 0
    // 0 1 0 0 -4 3 0 0
    ll ans = 0, memo = cnt[1];
    vector<ll> dp(200010, 0);
    for (int i = 2; i <= 200000; i++) {
        if (!cnt[i]) continue;
        ans += memo * cnt[i];
        for (int j = i; j <= 200000; j += i) {
            dp[j + 1] += cnt[i];
            if (j + i <= 200000) dp[j + i] -= i * cnt[i];
            if (j + i + 1 <= 200000) dp[j + i + 1] += (i - 1) * cnt[i];
        }
        memo += cnt[i] * i;
    }

    for (int i = 1; i <= 200000; i++) {
        dp[i] += dp[i - 1];
    }

    for (int i = 1; i <= 200000; i++) {
        dp[i] += dp[i - 1];
    }

    for (int i = 0; i <= 200000; i++) {
        ans += dp[i] * cnt[i];
    }
    cout << ans << newl;
    return 0;
}