public static void main ( String [ ] args ) {
  RealScanner sc = new RealScanner ( ) ;
  int n = sc . nextInt ( ) ;
  int [ ] arr = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    arr [ i ] = sc . nextInt ( ) ;
  }
  int count1 = 0 , count0 = 0 , max = - 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int val = arr [ i ] ;
    if ( val == 1 ) {
      count1 ++ ;
      if ( count0 > 0 ) {
        count0 -- ;
      }
    }
    if ( val == 0 ) {
      count0 ++ ;
      if ( count0 > max ) {
        max = count0 ;
      }
    }
  }
  System . out . println ( count1 + max ) ;
}

public static void main ( String [ ] args ) { RealScanner sc = new RealScanner ( ) ; int n = sc . nextInt ( ) ; int [ ] arr = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { arr [ i ] = sc . nextInt ( ) ; } int count1 = 0 , count0 = 0 , max = - 1 ; for ( int i = 0 ; i < n ; i ++ ) { int val = arr [ i ] ; if ( val == 1 ) { count1 ++ ; if ( count0 > 0 ) { count0 -- ; } } if ( val == 0 ) { count0 ++ ; if ( count0 > max ) { max = count0 ; } } } System . out . println ( count1 + max ) ; }
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