public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int events = scanner . nextInt ( ) ;
  scanner . nextLine ( ) ;
  int availableCops = 0 ;
  int crimeUntreated = 0 ;
  for ( int i = 0 ;
  i < events ;
  i ++ ) {
    int s = scanner . nextInt ( ) ;
    if ( s >= 1 ) {
      availableCops += s ;
    }
    if ( s == - 1 ) {
      if ( availableCops == 0 ) {
        crimeUntreated ++ ;
      }
      else {
        availableCops -- ;
      }
    }
  }
  System . out . println ( crimeUntreated ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int events = scanner . nextInt ( ) ; scanner . nextLine ( ) ; int availableCops = 0 ; int crimeUntreated = 0 ; for ( int i = 0 ; i < events ; i ++ ) { int s = scanner . nextInt ( ) ; if ( s >= 1 ) { availableCops += s ; } if ( s == - 1 ) { if ( availableCops == 0 ) { crimeUntreated ++ ; } else { availableCops -- ; } } } System . out . println ( crimeUntreated ) ; }
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