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