public static int countPairs ( int n ) {
  if ( n == 2 ) return 4 ;
  int num = ( ( n / 2 ) + 1 ) ;
  int max = n % num ;
  int count = n - max ;
  return count ;
}

public static int countPairs ( int n ) { if ( n == 2 ) return 4 ; int num = ( ( n / 2 ) + 1 ) ; int max = n % num ; int count = n - max ; return count ; }
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