#include <bits/stdc++.h>
using namespace std;
int main() {
  long long k, l, m, n, d, mi, countt = 0, i;
  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) {
      countt++;
    }
  }
  cout << countt << endl;
  return 0;
}
