#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define fi first
#define se second
#define pii pair <int, int>
#define pll pair <ll, ll>
#define mt make_tuple
#define mp make_pair
#define all(x) (x).begin(), (x).end()
#define pb push_back
const int N = 1e5 + 1;
const int MAXN = 5e5 + 10;
const int LG = 20;
const int INF = 1e9 + 10;
const ll LL_INF = 1e18 + 10;
const ll MOD1 = 1e9 + 7;
const ll MOD2 = 998244353;
tuple <int, int, char> moves[4] {
{0, 1, 'R'}, {1, 0, 'D'}, {0, -1, 'L'}, {-1, 0, 'U'}
};
const int P = 1e7 + 1;
int n, p[N], par[N], nxt[P];
ll ans = 0;
int get_par(int v) {
return (par[v] < 0) ? v : par[v] = get_par(par[v]);
}
void merge(int u, int v, int w) {
u = get_par(u);
v = get_par(v);
if (u == v) return;
if (par[u] < par[v]) swap(u, v);
ans += w;
par[v] += par[u];
par[u] = v;
}
signed main() {
ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);
cin >> n;
for (int i = 0; i < n; i++) cin >> p[i];
sort(p, p + n);
fill(nxt, nxt + P, -1);
for (int i = 0; i < n; i++) nxt[p[i]] = i;
for (int i = P - 1; ~i; i--) {
if (nxt[i] == -1) nxt[i] = nxt[i + 1];
}
vector <vector <pii>> edge(P);
for (int i = 1; i <= p[n - 1]; i++) {
if (p[nxt[i]] != i) continue;
if (nxt[i + 1] == -1) break;
edge[p[nxt[i + 1]] % i].pb(mp(nxt[i], nxt[i + 1]));
for (int j = 2 * i; j <= p[n - 1]; j += i) {
if (nxt[j] == -1) break;
edge[p[nxt[j]] % i].pb(mp(nxt[i], nxt[j]));
}
}
for (int i = 0; i < P; i++) {
for (auto [u, v]: edge[i]) {
merge(u, v, i);
if (get_par(1) == -n) {
cout << ans << '\n';
return 0;
}
}
}
cout << ans << '\n';
return 0;
}
