public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  Map < Integer , ArrayList < Integer >> map = new HashMap < > ( ) ;
  int n = sc . nextInt ( ) ;
  int a [ ] = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a [ i ] = sc . nextInt ( ) ;
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int cursum = 0 ;
    int min = Integer . MAX_VALUE ;
    for ( int j = i ;
    j < n ;
    j ++ ) {
      ArrayList < Integer > al = new ArrayList < > ( ) ;
      if ( a [ j ] == 0 ) {
        cursum -= 1 ;
      }
      else {
        cursum += 1 ;
      }
      if ( cursum < min ) {
        min = cursum ;
        al . add ( i ) ;
        al . add ( j ) ;
        map . put ( min , al ) ;
      }
    }
  }
  int min = Integer . MAX_VALUE ;
  for ( int k : map . keySet ( ) ) {
    if ( min > k ) min = k ;
  }
  ArrayList < Integer > p = map . get ( min ) ;
  int x = p . get ( 0 ) ;
  int y = p . get ( 1 ) ;
  for ( int i = x ;
  i <= y ;
  i ++ ) {
    if ( a [ i ] == 1 ) a [ i ] = 0 ;
    else a [ i ] = 1 ;
  }
  int sum = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    sum += a [ i ] ;
  }
  System . out . println ( sum ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; Map < Integer , ArrayList < Integer > > map = new HashMap < > ( ) ; int n = sc . nextInt ( ) ; int a [ ] = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = sc . nextInt ( ) ; } for ( int i = 0 ; i < n ; i ++ ) { int cursum = 0 ; int min = Integer . MAX_VALUE ; for ( int j = i ; j < n ; j ++ ) { ArrayList < Integer > al = new ArrayList < > ( ) ; if ( a [ j ] == 0 ) { cursum -= 1 ; } else { cursum += 1 ; } if ( cursum < min ) { min = cursum ; al . add ( i ) ; al . add ( j ) ; map . put ( min , al ) ; } } } int min = Integer . MAX_VALUE ; for ( int k : map . keySet ( ) ) { if ( min > k ) min = k ; } ArrayList < Integer > p = map . get ( min ) ; int x = p . get ( 0 ) ; int y = p . get ( 1 ) ; for ( int i = x ; i <= y ; i ++ ) { if ( a [ i ] == 1 ) a [ i ] = 0 ; else a [ i ] = 1 ; } int sum = 0 ; for ( int i = 0 ; i < n ; i ++ ) { sum += a [ i ] ; } System . out . println ( sum ) ; }
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