public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) , k = sc . nextInt ( ) ;
  int [ ] a = new int [ n ] , wake = new int [ n ] ;
  int sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) a [ i ] = sc . nextInt ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    wake [ i ] = sc . nextInt ( ) ;
    if ( wake [ i ] == 1 ) sum += a [ i ] ;
  }
  int zeros = 0 , max = 0 ;
  for ( int i = 0 ;
  i < k ;
  i ++ ) if ( wake [ i ] == 0 ) {
    zeros ++ ;
    max += a [ i ] ;
  }
  int temp = max ;
  for ( int i = 1 ;
  i <= n - k ;
  i ++ ) {
    if ( wake [ i - 1 ] == 0 ) temp -= a [ i - 1 ] ;
    if ( wake [ i + k - 1 ] == 0 ) temp += a [ i + k - 1 ] ;
    max = Math . max ( max , temp ) ;
  }
  System . out . println ( sum + max ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) , k = sc . nextInt ( ) ; int [ ] a = new int [ n ] , wake = new int [ n ] ; int sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) a [ i ] = sc . nextInt ( ) ; for ( int i = 0 ; i < n ; i ++ ) { wake [ i ] = sc . nextInt ( ) ; if ( wake [ i ] == 1 ) sum += a [ i ] ; } int zeros = 0 , max = 0 ; for ( int i = 0 ; i < k ; i ++ ) if ( wake [ i ] == 0 ) { zeros ++ ; max += a [ i ] ; } int temp = max ; for ( int i = 1 ; i <= n - k ; i ++ ) { if ( wake [ i - 1 ] == 0 ) temp -= a [ i - 1 ] ; if ( wake [ i + k - 1 ] == 0 ) temp += a [ i + k - 1 ] ; max = Math . max ( max , temp ) ; } System . out . println ( sum + max ) ; }
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