score=list(map(int,input().split()))
lst=list(map(int,input().split()))
time=lst[-1]
ans=0
for i in range(4):
    if time>=score[i]*lst[i]:
        time-=score[i]*lst[i]
        ans+=score[i]
    else:
        ans+=time//(lst[i])
        print(ans)
        exit()
print(sum(score))