#include <bits/stdc++.h>
const int MAXN = 1000000007;
const int z = 0;
using namespace std;
int main() {
  int k, l, m, n, d, ans = 0;
  cin >> k >> l >> m >> n >> d;
  for (int i = 1; i <= d; i++) {
    if (i % k == 0 or i % l == 0 or i % m == 0 or i % n == 0) {
      ans++;
    }
  }
  cout << ans;
  return 0;
}
