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

ans = 0
time = T
for t, m in sorted([(P, A), (Q, B), (R, C), (S, D)]):
    x = min(m, time // t)
    ans += x
    time -= x * t

print(ans)