public static void main ( String ag [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  int i , j , k ;
  int N = sc . nextInt ( ) ;
  long A [ ] = new long [ N + 1 ] ;
  for ( i = 1 ;
  i <= N ;
  i ++ ) {
    A [ i ] = sc . nextLong ( ) ;
  }
  HashMap < Long , Long > odd = new HashMap < > ( ) ;
  HashMap < Long , Long > even = new HashMap < > ( ) ;
  odd . put ( 0L , 1L ) ;
  long xor = 0 ;
  long ans = 0 ;
  for ( i = 1 ;
  i <= N ;
  i ++ ) {
    xor ^= A [ i ] ;
    if ( i % 2 == 0 ) {
      if ( odd . containsKey ( xor ) ) {
        ans += odd . get ( xor ) ;
        odd . put ( xor , odd . get ( xor ) + 1 ) ;
      }
      else {
        odd . put ( xor , 1L ) ;
      }
    }
    else {
      if ( even . containsKey ( xor ) ) {
        ans += even . get ( xor ) ;
        even . put ( xor , even . get ( xor ) + 1 ) ;
      }
      else {
        even . put ( xor , 1L ) ;
      }
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String ag [ ] ) { Scanner sc = new Scanner ( System . in ) ; int i , j , k ; int N = sc . nextInt ( ) ; long A [ ] = new long [ N + 1 ] ; for ( i = 1 ; i <= N ; i ++ ) { A [ i ] = sc . nextLong ( ) ; } HashMap < Long , Long > odd = new HashMap < > ( ) ; HashMap < Long , Long > even = new HashMap < > ( ) ; odd . put ( 0L , 1L ) ; long xor = 0 ; long ans = 0 ; for ( i = 1 ; i <= N ; i ++ ) { xor ^= A [ i ] ; if ( i % 2 == 0 ) { if ( odd . containsKey ( xor ) ) { ans += odd . get ( xor ) ; odd . put ( xor , odd . get ( xor ) + 1 ) ; } else { odd . put ( xor , 1L ) ; } } else { if ( even . containsKey ( xor ) ) { ans += even . get ( xor ) ; even . put ( xor , even . get ( xor ) + 1 ) ; } else { even . put ( xor , 1L ) ; } } } System . out . println ( ans ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list)))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier) (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (decimal_integer_literal)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (assignment_expression left: (identifier) right: (decimal_integer_literal)) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (decimal_integer_literal)))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (decimal_integer_literal))))))) alternative: (block (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (decimal_integer_literal)))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (decimal_integer_literal)))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))