#include<bits/stdc++.h>
using namespace std;
#define sz(v) (int)(v).size()
#define all(v) (v).begin(), (v).end()
#define compact(v) (v).erase(unique(all(v)), (v).end())
using ll = long long;
const int N = 1e5, M = 1e7 + 1;
int n, i, nxt, par[N], answer, near[M];
int asc(int x){
return par[x] < 0 ? x : par[x] = asc(par[x]);
}
bool join(int u, int v){
u = asc(u), v = asc(v);
if(u == v) return false;
if(par[u] > par[v]) swap(u, v);
par[u] += par[v];
par[v] = u;
return true;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin >> n;
vector<int> a(n);
for(i = 0; i < n; i++){
cin >> a[i];
}
sort(all(a)), compact(a);
for(i = 0; i < sz(a); i++){
near[a[i]] = i;
par[i] = -1;
}
for(i = a.back(); i > a[0] + 1; i--){
near[i - 1] = (!near[i - 1] ? near[i] : near[i - 1]);
}
vector<pair<int, pair<int,int>>> E;
for(i = sz(a) - 2; i >= 0; i--){
E.push_back(make_pair(a[i + 1] % a[i], make_pair(i, i + 1)));
for(nxt = a[i] * 2; nxt <= a.back(); nxt += a[i]){
E.push_back(make_pair(a[near[nxt]] % a[i], make_pair(i, near[nxt])));
}
}
sort(all(E));
for(i = 0; i < sz(E); i++){
if(join(E[i].second.first, E[i].second.second)){
answer = answer + E[i].first;
}
}
cout << answer << "\n";
return 0;
}
