#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, i, m, r = 0, t;
  cin >> n;
  for (i = 0; i < n; i++) {
    cin >> m;
    while ((m) && (r)) {
      if (m > r)
        m %= r;
      else
        r %= m;
    }
    r += m;
  }
  cout << r * n << endl;
}
