a, b, c, d = map(int, input().split())
p, q, r, s, t = map(int, input().split())

A = [(a, p), (b, q), (c, r), (d, s)]
A.sort(key=lambda x: x[1])
tot = 0
for a, b in A:
    x = min(a, t // b)
    tot += x
    t -= x * b

print(tot)