Butler Ostin want Arkady row odd number fountain beautiful row number fountain notThe butler want Arkady n garden each garden row m cell ith garden fountain cell li ri inclusive fountain garden the issue garden contain number fountain wrong ArkadyOstin wants choose integers ab gardens start cell end cell b of course segment suit Ostin garden zero odd number fountain segment also necessary garden fountain segment bHelp Ostin find total length segment ie sum value ba1 suitable pair ab