英语翻译

英语翻译
The elimination rounds are divided into main and additional.Each of the main elimination rounds consists of c problems,the winners of the round are the first n people in the rating list.Each of the additional elimination rounds consists of d problems.The winner of the additional round is one person.Besides,k winners of the past finals are invited to the finals without elimination.
As a result of all elimination rounds at least n·m people should go to the finals.You need to organize elimination rounds in such a way,that at least n·m people go to the finals,and the total amount of used problems in all rounds is as small as possible.