#include <bits/stdc++.h>
using namespace std;
int main() {
  long long 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 << count << endl;
}
