#include <bits/stdc++.h>
using namespace std;
bool i_v(char a) {
  if (a == 'a' || a == 'e' || a == 'u' || a == 'i' || a == 'o') return 1;
  return 0;
}
int main() {
  int k, l, m, n, d, c = 0;
  cin >> k >> l >> m >> n >> d;
  for (int i = 1; i <= d; i++) {
    if (i % k == 0 || i % l == 0 || i % m == 0 || i % n == 0) c++;
  }
  cout << c << endl;
  return 0;
}
