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