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