#include <bits/stdc++.h>
using namespace std;
int main() {
  int l, m, n, k, d, count = 0, i;
  scanf("%d%d%d%d%d", &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++;
  }
  printf("%d\n", count);
  return 0;
}
