public static void main ( String [ ] args ) {
  int n = in . nextInt ( ) ;
  boolean [ ] tab = new boolean [ 1000001 ] ;
  int min = 0 ;
  int c = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    String s = in . next ( ) ;
    int k = in . nextInt ( ) ;
    if ( s . charAt ( 0 ) == '-' ) {
      if ( ! tab [ k ] ) min ++ ;
      else c -- ;
    }
    else c ++ ;
    tab [ k ] = true ;
    if ( c > min ) min = c ;
  }
  System . out . println ( min ) ;
}

public static void main ( String [ ] args ) { int n = in . nextInt ( ) ; boolean [ ] tab = new boolean [ 1000001 ] ; int min = 0 ; int c = 0 ; for ( int i = 0 ; i < n ; i ++ ) { String s = in . next ( ) ; int k = in . nextInt ( ) ; if ( s . charAt ( 0 ) == ' - ' ) { if ( ! tab [ k ] ) min ++ ; else c -- ; } else c ++ ; tab [ k ] = true ; if ( c > min ) min = c ; } System . out . println ( min ) ; }
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