A, B, C, D = map(int, input().split())
P, Q, R, S, T = map(int, input().split())
X = [(P, A), (Q, B), (R, C), (S, D)]
X.sort()
X.reverse()
ans = 0
while T and len(X):
  t, c = X.pop()
  cc = min(c, T // t)
  ans += cc
  T -= cc * t
print(ans)