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