/* Culcurates final mana cost */
need_mana_frac = 0;
s64b_div(&need_mana, &need_mana_frac, 0, 3); /* Divide by 3 */
need_mana += (CASTING_HEX_NUM(p_ptr) - 1);
/* Culcurates final mana cost */
need_mana_frac = 0;
s64b_div(&need_mana, &need_mana_frac, 0, 3); /* Divide by 3 */
need_mana += (CASTING_HEX_NUM(p_ptr) - 1);