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