#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using pp=pair<int,int>;
#define sr string 
#define vc vector
#define db double
#define fi first
#define se second
#define rep(i,n) for(int i=0;i<(int)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=3e5;
	vc<ll>v(m,0); vc<ll>s(m,0);
	rep(i,n){
		ll a;cin>>a;
		v[a]++;
	}
	rep(i,m)s[i]=v[i]*i;
	rep(i,m-1)v[i+1]+=v[i];
	rep(i,m-1)s[i+1]+=s[i];
	ll ans=0;
	for(int i=1;i<m;i++){
		ll now=v[i]-v[i-1];
		ans+=now*(v[m-1]-v[i])*i;
		for(int j=i;j<m;j+=i){
			int nj=min(m-1,j+i-1);
			ans-=now*(s[nj]-s[j]);
			ans+=now*(v[nj]-v[j])*j;
		}
	}
	cout<<ans;
}