the Berland University prepare celebrate 256th anniversary found A specially appoint Vice Rector celebration prepare decorate campus in center campus n ice sculpture erect the sculpture arrange circle equal distance form regular ngon they number clockwise order number 1 nThe site University conduct vote estimate sculpture characteristic ti degree sculpture attractiveness the value ti positive negative zeroWhen university rector come evaluate work say perfect arrangement he suggest melt sculpture remain sculpture form regular polygon number vertex 3 n sum ti value remain sculpture maximize help Vice Rector analyze criticism find maximum value ti sum obtain way it allow melt sculpture the sculpture move