#include <bits/stdc++.h>
using namespace std;
int main() {
  int k, l, m, n, d, i, counter = 0;
  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) counter++;
  }
  cout << counter;
}
