public static void main ( String [ ] args ) {
  int n = sc . nextInt ( ) ;
  int [ ] a = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a [ i ] = sc . nextInt ( ) ;
  }
  long sum = 0 ;
  long ans = 0 ;
  long xsum = 0 ;
  int r = 0 ;
  for ( int l = 0 ;
  l < n ;
  l ++ ) {
    if ( l != 0 ) {
      xsum ^= a [ l - 1 ] ;
      sum -= a [ l - 1 ] ;
    }
    while ( true ) {
      if ( r >= n ) {
        ans += r - l ;
        break ;
      }
      xsum ^= a [ r ] ;
      sum += a [ r ] ;
      if ( xsum != sum ) {
        ans += r - l ;
        xsum ^= a [ r ] ;
        sum -= a [ r ] ;
        break ;
      }
      r ++ ;
    }
  }
  ps . println ( ans ) ;
}

public static void main ( String [ ] args ) { int n = sc . nextInt ( ) ; int [ ] a = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = sc . nextInt ( ) ; } long sum = 0 ; long ans = 0 ; long xsum = 0 ; int r = 0 ; for ( int l = 0 ; l < n ; l ++ ) { if ( l != 0 ) { xsum ^= a [ l - 1 ] ; sum -= a [ l - 1 ] ; } while ( true ) { if ( r >= n ) { ans += r - l ; break ; } xsum ^= a [ r ] ; sum += a [ r ] ; if ( xsum != sum ) { ans += r - l ; xsum ^= a [ r ] ; sum -= a [ r ] ; break ; } r ++ ; } } ps . println ( ans ) ; }
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