roma play new expansion favorite game World Darkraft he new character go grindroma choice buy exactly n different weapon exactly m different armor set Weapon attack modifier a_i worth ca_i coin armor set j defense modifier b_j worth cb_j coinsafter choosing equipment Roma proceed defeat monster there p monster try defeat Monster k defense x_k attack y_k possess z_k coin Roma defeat monster weapon attack modifier large monster defense armor set defense modifier large monster attack that monster k defeat weapon armor set j a_i x_k b_j y_k after defeat monster Roma take coin during grind Roma defeat monster like Monsters respawn monster defeat onethanks Romas excessive donation assume infinite ingame currency afford weapon armor set still want maximize profit grind the profit define total coin obtain defeat monster minus cost equipment Note Roma purchase weapon armor set cover cost obtain coinshelp Roma find maximum profit grind