#include<iostream>
using namespace std;

const int MAX = 200001;
int main() {
    int N;
    int A[MAX], cumsum[MAX], divide[MAX];
    for (int i = 0;i < MAX;++ i) cumsum[i] = divide[i] = 0;
    long ans = 0;
    cin >> N;
    for (int i = 0;i < N;++ i) {
        cin >> A[i];
        ++ cumsum[A[i]];
        ans += A[i];
    }
    ans *= ans;
    for (int i = MAX - 1;i > 0;-- i) cumsum[i - 1] += cumsum[i];
    for (int i = 1;i < MAX;++ i) for(int j = i;j < MAX;j += i) divide[i] += cumsum[j];
    for (int i = 0;i < N;++ i) ans -= divide[i] * i;
    cout << ans << endl;
}