public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int n = in . nextInt ( ) ;
  int [ ] arr = new int [ n ] ;
  int count = 0 ;
  int hired = 0 , crime = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) arr [ i ] = in . nextInt ( ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( arr [ i ] < 0 ) ++ crime ;
    if ( arr [ i ] > 0 ) hired += arr [ i ] ;
    if ( arr [ i ] < 0 && hired > 0 ) {
      -- hired ;
      -- crime ;
    }
  }
  System . out . println ( Math . abs ( crime ) ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int n = in . nextInt ( ) ; int [ ] arr = new int [ n ] ; int count = 0 ; int hired = 0 , crime = 0 ; for ( int i = 0 ; i < n ; i ++ ) arr [ i ] = in . nextInt ( ) ; for ( int i = 0 ; i < n ; i ++ ) { if ( arr [ i ] < 0 ) ++ crime ; if ( arr [ i ] > 0 ) hired += arr [ i ] ; if ( arr [ i ] < 0 && hired > 0 ) { -- hired ; -- crime ; } } System . out . println ( Math . abs ( crime ) ) ; }
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