#include <bits/stdc++.h>
using namespace std;
int main() {
  int k, l, m, n, d, count = 0;
  cin >> k >> l >> m >> n >> d;
  int *p = new int[d];
  for (int i = 1; i <= d; i++)
    if ((i % k == 0) || (i % l == 0) || (i % m == 0) || (i % n == 0)) count++;
  cout << count;
  return 0;
}
