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