public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int arr [ ] = new int [ 101 ] ;
  int n = sc . nextInt ( ) ;
  arr [ 0 ] = 1 ;
  arr [ 1 ] = 5 ;
  for ( int i = 2 ;
  i < 101 ;
  i ++ ) {
    arr [ i ] = arr [ i - 1 ] + 2 * ( arr [ i - 1 ] - arr [ i - 2 ] ) ;
  }
  System . out . println ( 2 * n * ( n - 1 ) + 1 ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int arr [ ] = new int [ 101 ] ; int n = sc . nextInt ( ) ; arr [ 0 ] = 1 ; arr [ 1 ] = 5 ; for ( int i = 2 ; i < 101 ; i ++ ) { arr [ i ] = arr [ i - 1 ] + 2 * ( arr [ i - 1 ] - arr [ i - 2 ] ) ; } System . out . println ( 2 * n * ( n - 1 ) + 1 ) ; }
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