int rarity = 0;

            double rarity = 0;

                // Consider spellbook as rare as its rarest spell.
                // NOTE: This probably undervalues a book if it contains
                // lots of rare spells.

                // Consider spellbook as rare as the average of its
                // three rarest spells.
                int rarities[SPELLBOOK_SIZE];
                int count_valid = 0;

                    {
                        rarities[i] = 0;

                    }

                    if (rarity > spell_rarity(spell))
                        rarity = spell_rarity(spell);

                    rarities[i] = spell_rarity(spell);
                    count_valid++;

                ASSERT(count_valid > 0);
                std::sort(rarities, rarities + SPELLBOOK_SIZE);
                for (int i = SPELLBOOK_SIZE - 1; i >= SPELLBOOK_SIZE - 3; i--)
                    rarity += rarities[i];
                if (count_valid > 3)
                    count_valid = 3;
                rarity /= count_valid;

            valued += book_rarity(item.sub_type) * 50;

            valued += rarity * 50;

           agent == GOD_SIF_MUNA ? 3 : 1, BOOK_RANDART_LEVEL,

           agent == GOD_SIF_MUNA ? 4 : 1, BOOK_RANDART_LEVEL,

            if (w < 0)
                w = 0;