A,B,C,D = list(map(int,input().split()))
P,Q,R,S,T = list(map(int,input().split()))
a = [(A,P),(B,Q),(C,R),(D,S)]
a.sort(key=lambda x:x[1])

def check(n):
    now = 0
    time = 0
    for i in range(4):
        solve = min(a[i][0],n - now)
        now += solve
        time += solve * a[i][1]
    return time <= T

ok,ng = 0,10**18+1
while(ng - ok > 1):
    mid = (ok+ng)//2
    if(check(mid)):
        ok = mid
    else:
        ng = mid
print(ok if ok != 10**18 else A+B+C+D)