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