#include<bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using mint=modint998244353; //1000000007;
using ll=long long;
using pp=pair<ll,ll>;
#define sr string 
#define vc vector
#define fi first
#define se second
#define rep(i,n) for(ll i=0;i<(ll)n;i++)
#define pb push_back
#define all(v) v.begin(),v.end()
#define pque priority_queue
#define bpc(a) __builtin_popcount(a)
int main(){
  int n;cin>>n;
  int m=2e5+1;
  vc<int>v(m,0);
  rep(i,n){
    int a;cin>>a;
    v[a]++;
  }
  vc<ll>s(m,0);
  rep(i,m)s[i]+=(ll)v[i]*i;
  rep(i,m-1)s[i+1]+=s[i];
  rep(i,m-1)v[i+1]+=v[i];
  ll ans=0;
  for(int i=1;i<m;i++){
    ll res=0;
    for(int j=i;j<=m;j+=i){
      res+=s[j-1]-s[j-i];
      res-=(ll)(j-i)*(v[j-1]-v[j-i]);
    }
    ans+=res*(v[i]-v[i-1]);
  }
  cout<<ans;
}