"""

"""

A,B,C,D = map(int,input().split())
P,Q,R,S,T = map(int,input().split())

tc = [ (P,A) , (Q,B) , (R,C) , (S,D) ]
tc.sort()

ans = 0
for t,c in tc:

    now = min( T // t , c )
    ans += now
    T -= now * t

print (ans)