public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  long [ ] [ ] dp = new long [ n ] [ 3 ] ;
  long a0 = sc . nextLong ( ) ;
  dp [ 0 ] [ 0 ] = a0 ;
  dp [ 0 ] [ 1 ] = Long . MIN_VALUE / 10 ;
  dp [ 0 ] [ 2 ] = Long . MIN_VALUE / 10 ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    String str = sc . next ( ) ;
    long v = sc . nextLong ( ) ;
    if ( str . equals ( "+" ) ) {
      dp [ i ] [ 0 ] = Math . max ( Math . max ( dp [ i - 1 ] [ 0 ] + v , dp [ i - 1 ] [ 1 ] + v ) , dp [ i - 1 ] [ 2 ] + v ) ;
      dp [ i ] [ 1 ] = Math . max ( dp [ i - 1 ] [ 1 ] - v , dp [ i - 1 ] [ 2 ] + v ) ;
      dp [ i ] [ 2 ] = dp [ i - 1 ] [ 2 ] + v ;
    }
    else {
      dp [ i ] [ 0 ] = Math . max ( Math . max ( dp [ i - 1 ] [ 0 ] - v , dp [ i - 1 ] [ 1 ] + v ) , dp [ i - 1 ] [ 2 ] + v ) ;
      dp [ i ] [ 1 ] = Math . max ( Math . max ( dp [ i - 1 ] [ 0 ] - v , dp [ i - 1 ] [ 1 ] + v ) , dp [ i - 1 ] [ 2 ] + v ) ;
      dp [ i ] [ 2 ] = Math . max ( dp [ i - 1 ] [ 1 ] + v , dp [ i - 1 ] [ 2 ] + v ) ;
    }
  }
  System . out . println ( dp [ n - 1 ] [ 0 ] ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; long [ ] [ ] dp = new long [ n ] [ 3 ] ; long a0 = sc . nextLong ( ) ; dp [ 0 ] [ 0 ] = a0 ; dp [ 0 ] [ 1 ] = Long . MIN_VALUE / 10 ; dp [ 0 ] [ 2 ] = Long . MIN_VALUE / 10 ; for ( int i = 1 ; i < n ; i ++ ) { String str = sc . next ( ) ; long v = sc . nextLong ( ) ; if ( str . equals ( " + " ) ) { dp [ i ] [ 0 ] = Math . max ( Math . max ( dp [ i - 1 ] [ 0 ] + v , dp [ i - 1 ] [ 1 ] + v ) , dp [ i - 1 ] [ 2 ] + v ) ; dp [ i ] [ 1 ] = Math . max ( dp [ i - 1 ] [ 1 ] - v , dp [ i - 1 ] [ 2 ] + v ) ; dp [ i ] [ 2 ] = dp [ i - 1 ] [ 2 ] + v ; } else { dp [ i ] [ 0 ] = Math . max ( Math . max ( dp [ i - 1 ] [ 0 ] - v , dp [ i - 1 ] [ 1 ] + v ) , dp [ i - 1 ] [ 2 ] + v ) ; dp [ i ] [ 1 ] = Math . max ( Math . max ( dp [ i - 1 ] [ 0 ] - v , dp [ i - 1 ] [ 1 ] + v ) , dp [ i - 1 ] [ 2 ] + v ) ; dp [ i ] [ 2 ] = Math . max ( dp [ i - 1 ] [ 1 ] + v , dp [ i - 1 ] [ 2 ] + v ) ; } } System . out . println ( dp [ n - 1 ] [ 0 ] ) ; }
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