#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> A(N);
  for (int i = 0; i < N; i++){
    cin >> A[i];
  }
  vector<int> c(500001, 0);
  for (int i = 0; i < N; i++){
    c[A[i]]++;
  }
  vector<long long> S(500002, 0);
  for (int i = 0; i <= 500000; i++){
    S[i + 1] = S[i] + c[i];
  }
  long long sum = 0;
  for (int i = 1; i <= 200000; i++){
    for (int j = i; j <= 200000; j += i){
      sum += c[i] * (S[j + i] - S[j]) * j;
    }
  }
  long long sum1 = 0;
  for (int i = 0; i < N; i++){
    sum1 += A[i];
  }
  sum1 *= N;
  cout << sum1 - sum << endl;
}