a, b, c, d = map(int, input().split())
p, q, r, s, t = map(int, input().split())
p = [(p, a), (q, b), (r, c), (s, d)]
p.sort()
ans = 0
for i in range(4):
    if p[i][0]*p[i][1] <= t:
        ans += p[i][1]
        t -= p[i][0]*p[i][1]
    else:
        ans += t//p[i][0]
        break
print(ans)