public static void main ( String [ ] args ) {
  int n , d ;
  Scanner sc = new Scanner ( System . in ) ;
  n = sc . nextInt ( ) ;
  d = sc . nextInt ( ) ;
  String input ;
  int maxWin = 0 ;
  int counter = 0 ;
  boolean allOpponents ;
  boolean prevWin = true ;
  for ( int i = 0 ;
  i < d ;
  i ++ ) {
    sc . reset ( ) ;
    input = sc . next ( ) ;
    allOpponents = true ;
    for ( int j = 0 ;
    j < n ;
    j ++ ) {
      if ( input . charAt ( j ) == '0' ) {
        allOpponents = false ;
        counter ++ ;
        break ;
      }
    }
    if ( counter > maxWin ) {
      maxWin = counter ;
    }
    if ( allOpponents ) {
      counter = 0 ;
    }
  }
  System . out . println ( maxWin ) ;
}

public static void main ( String [ ] args ) { int n , d ; Scanner sc = new Scanner ( System . in ) ; n = sc . nextInt ( ) ; d = sc . nextInt ( ) ; String input ; int maxWin = 0 ; int counter = 0 ; boolean allOpponents ; boolean prevWin = true ; for ( int i = 0 ; i < d ; i ++ ) { sc . reset ( ) ; input = sc . next ( ) ; allOpponents = true ; for ( int j = 0 ; j < n ; j ++ ) { if ( input . charAt ( j ) == '0' ) { allOpponents = false ; counter ++ ; break ; } } if ( counter > maxWin ) { maxWin = counter ; } if ( allOpponents ) { counter = 0 ; } } System . out . println ( maxWin ) ; }
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