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