a,b,c,d=map(int,input().split())
p,q,r,s,t=map(int,input().split())
ans=0
mondai=[(p,a),(q,b),(r,c),(s,d)]
mondai.sort()
for ti,ai in mondai:
    mx=min(ai,t//ti)
    t-=ti*mx
    ans+=mx
print(ans)