PE2b

def maximum_cost(shop, total):
    final = [-1]

    def works(shopa, totala):
        if totala < 0:
            return False
        elif totala == 0:
            return True
        else:
            ans = False
            for bundleb in shopa:
                if works(shopa, totala - get_size(bundleb)):
                    ans = True
                    break
            return ans

    def recur(shopb, totalb):
        possible = []
        if totalb <= 0:
            return [0]
        else:

            for bundle in shopb:
                if works(shopb, totalb - get_size(bundle)) or totalb == 0:
                    for i in recur(shopb, totalb - get_size(bundle)):
                        possible.append(get_cost(bundle) + i)
            return possible

    for bundlea in shop:
        if is_pink_rose(bundlea):
            final.append(get_cost(bundlea) + max(recur(shop, total - get_size(bundlea))))

    return max(final)



    for bundlea in shop:
        if is_pink_rose(bundlea):
            final.append(get_cost(bundlea) + max(recurhelper(shop, total - get_size(bundlea))))

    return max(final)