#include <bits/stdc++.h>
using namespace std;
int main() {
  int k, l, m, n;
  long d, cnt = 0;
  cin >> k >> l >> m >> n >> d;
  if ((k == 1) || (l == 1) || (m == 1) || (n == 1))
    cout << d << endl;
  else {
    for (int i = 1; i <= d; i++)
      if ((i % k == 0) | (i % l == 0) || (i % m == 0) || (i % n == 0)) cnt++;
    cout << cnt << endl;
  }
  return 0;
}
