public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  String line = scanner . nextLine ( ) ;
  StringTokenizer tokenizer = new StringTokenizer ( line ) ;
  int n = Integer . parseInt ( tokenizer . nextToken ( ) ) ;
  int m = Integer . parseInt ( tokenizer . nextToken ( ) ) ;
  int maxConsecutiveCount = 0 ;
  int consecutiveCount = 0 ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    String row = scanner . nextLine ( ) ;
    boolean aryaWins = row . contains ( "0" ) ;
    if ( aryaWins ) {
      consecutiveCount ++ ;
      if ( consecutiveCount > maxConsecutiveCount ) {
        maxConsecutiveCount = consecutiveCount ;
      }
    }
    else {
      consecutiveCount = 0 ;
    }
  }
  System . out . println ( maxConsecutiveCount ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; String line = scanner . nextLine ( ) ; StringTokenizer tokenizer = new StringTokenizer ( line ) ; int n = Integer . parseInt ( tokenizer . nextToken ( ) ) ; int m = Integer . parseInt ( tokenizer . nextToken ( ) ) ; int maxConsecutiveCount = 0 ; int consecutiveCount = 0 ; for ( int i = 0 ; i < m ; i ++ ) { String row = scanner . nextLine ( ) ; boolean aryaWins = row . contains ( "0" ) ; if ( aryaWins ) { consecutiveCount ++ ; if ( consecutiveCount > maxConsecutiveCount ) { maxConsecutiveCount = consecutiveCount ; } } else { consecutiveCount = 0 ; } } System . out . println ( maxConsecutiveCount ) ; }
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