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

L = {P: A, Q: B, R: C, S: D}
qt = dict(sorted(L.items()))
toutle = 0

def TAndQ(qt,T):
    first_key, first_value = next(iter(qt.items()))
    if first_key * first_value <= T:
        toutle = toutle + first_value
        T = T - first_key * first_value
        del qt[first_key]
        return TAndQ(qt,T)
    elif first_key * first_value > T:
        toutle = toutle + T // first_key
        return toutle
    else:
        return toutle

print(toutle)