def main():
  a, b, c, d,    = map(int, input().split())
  p, q, r, s, t, = map(int, input().split())
  ls = [(p,a), (q,b), (r,c), (s,d)]
  ls.sort()
  ans = 0
  for ti, ai in ls:
    cnt = min(t // ti, ai)
    ans += cnt
    t -= ti * cnt
  print(ans)

main()