#include<iostream>
using namespace std;

int main() {
    int N;
    int A[200000];
    long ans = 0;
    cin >> N;
    for (int i = 0;i < N;++ i) cin >> A[i];
    for (int i = 0;i < N;++ i) for (int j = 0;j < N;++ j) ans += A[i] % A[j];
    cout << ans << endl;
}