a,b,c,d = map(int,input().split())
p,q,r,s,t = map(int,input().split())
count = 0
mondai = [a,b,c,d]
zikann = [p,q,r,s]

for i,j in zip(mondai, zikann):
    if (i * j) <= t:
        count += i
        t -= i * j
    elif (i * j) >= t:
        count += (t // j)
        break
print(count)