public static void main ( String [ ] args ) throws IOException {
  BufferedReader r = new BufferedReader ( new InputStreamReader ( System . in ) , 1 ) ;
  String s ;
  String sl [ ] ;
  s = r . readLine ( ) ;
  int n = Integer . parseInt ( s ) ;
  HashMap < Long , Long > m = new HashMap < > ( ) ;
  m . put ( 0L , 1L ) ;
  long a = 0 ;
  long v = 0 ;
  s = r . readLine ( ) ;
  sl = s . split ( " " ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    v += Long . parseLong ( sl [ i ] ) ;
    Long z = m . get ( v ) ;
    if ( z != null && z > 0 ) {
      a += z ;
    }
    z = m . getOrDefault ( v , 0L ) ;
    m . put ( v , z + 1 ) ;
  }
  System . out . println ( a ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader r = new BufferedReader ( new InputStreamReader ( System . in ) , 1 ) ; String s ; String sl [ ] ; s = r . readLine ( ) ; int n = Integer . parseInt ( s ) ; HashMap < Long , Long > m = new HashMap < > ( ) ; m . put ( 0L , 1L ) ; long a = 0 ; long v = 0 ; s = r . readLine ( ) ; sl = s . split ( " ▁ " ) ; for ( int i = 0 ; i < n ; i ++ ) { v += Long . parseLong ( sl [ i ] ) ; Long z = m . get ( v ) ; if ( z != null && z > 0 ) { a += z ; } z = m . getOrDefault ( v , 0L ) ; m . put ( v , z + 1 ) ; } System . out . println ( a ) ; }
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