Codeforces Round #347 (Div. 1) B. International Olympiad
InternationalAbbreviationOlympiadtakesplaceannuallystartingfrom1989.EachyearthecompetitionreceivesanabbreviationofformIAO'y,whereystandsforsomenumberofconsequentlastdigitsofthecurrentyear.Organizersal