one day Igor K stop programming take math one late autumn evening sit table read book think the follow statement catch attention among people pairwise acquaint people pairwise unacquainted peopleigor could not require minimum 6 people well that s people keep repeat mind Lets Max Ilya Vova know and let add Dima Oleg Vova acquaint now math rubbishIgor K take 5 friend write friend now want check true people pairwise acquaint pairwise acquaint people