A, B, C, D = map(int, input().split())
P, Q, R, S, T = map(int, input().split())

l = sorted([(P, A), (Q, B), (R, C), (S, D)])
rem = T
ans = 0
for time, num in l:
    if rem > time * num:
        rem -= time * num
        ans += num
    else:
        ans += rem // time
        break
print(ans)