a,b,c,d,p,q,r,s,t=map(int,open(0).read().split())
e=[(a,p),(b,q),(c,r),(d,s)]
e.sort(lambda x:x[1])
ans=0
for x,y in e:
  z=min(x,t//y)
  ans+=z
  t-=z*y
print(ans)