public static void main ( String [ ] args ) {
  Scanner s = new Scanner ( System . in ) ;
  int n = s . nextInt ( ) ;
  HashMap < String , Integer > timeFreq = new HashMap < > ( ) ;
  int cashes = 1 ;
  while ( n -- > 0 ) {
    String H = s . next ( ) ;
    String M = s . next ( ) ;
    String time = H . concat ( ":" ) . concat ( M ) ;
    timeFreq . computeIfPresent ( time , ( K , V ) -> V + 1 ) ;
    timeFreq . putIfAbsent ( time , 1 ) ;
    cashes = Math . max ( timeFreq . get ( time ) , cashes ) ;
  }
  System . out . println ( cashes ) ;
}

public static void main ( String [ ] args ) { Scanner s = new Scanner ( System . in ) ; int n = s . nextInt ( ) ; HashMap < String , Integer > timeFreq = new HashMap < > ( ) ; int cashes = 1 ; while ( n -- > 0 ) { String H = s . next ( ) ; String M = s . next ( ) ; String time = H . concat ( " : " ) . concat ( M ) ; timeFreq . computeIfPresent ( time , ( K , V ) -> V + 1 ) ; timeFreq . putIfAbsent ( time , 1 ) ; cashes = Math . max ( timeFreq . get ( time ) , cashes ) ; } System . out . println ( cashes ) ; }
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