public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  PrintWriter out = new PrintWriter ( System . out , true ) ;
  int N = in . nextInt ( ) ;
  String [ ] board = new String [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) board [ i ] = in . next ( ) ;
  int res = 0 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    int count = 0 ;
    for ( int j = 0 ;
    j < N ;
    j ++ ) if ( board [ j ] . equals ( board [ i ] ) ) count ++ ;
    res = Math . max ( res , count ) ;
  }
  out . println ( res ) ;
  out . close ( ) ;
  System . exit ( 0 ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; PrintWriter out = new PrintWriter ( System . out , true ) ; int N = in . nextInt ( ) ; String [ ] board = new String [ N ] ; for ( int i = 0 ; i < N ; i ++ ) board [ i ] = in . next ( ) ; int res = 0 ; for ( int i = 0 ; i < N ; i ++ ) { int count = 0 ; for ( int j = 0 ; j < N ; j ++ ) if ( board [ j ] . equals ( board [ i ] ) ) count ++ ; res = Math . max ( res , count ) ; } out . println ( res ) ; out . close ( ) ; System . exit ( 0 ) ; }
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