levian work accountant large company Levian know company earn n consecutive month ith month company income equal a_i positive income mean profit negative income mean loss zero income mean change because general selfisolation lceil tfracn2 rceil month income completely unstable stabilize lfloor tfracn2 rfloor month income sameLevian decide tell director nk1 number total income company k consecutive month in word 1 nk1 value a_i a_i1 ldot a_i k 1 for example a1 0 1 2 2 k3 number 0 3 5unfortunately total income report levian profit income le 0 director angry fire fail accountantsave Levians career find k k month row company profit report impossible