public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  long [ ] A = new long [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    A [ i ] = sc . nextLong ( ) ;
  }
  sc . close ( ) ;
  long [ ] b = new long [ N + 1 ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    b [ i + 1 ] = b [ i ] + A [ i ] ;
  }
  Map < Long , Long > m = new TreeMap < Long , Long > ( ) ;
  for ( int i = 1 ;
  i <= N ;
  i ++ ) {
    m . merge ( b [ i ] , 1l , ( v1 , v2 ) -> ( v1 + v2 ) ) ;
  }
  long ans = 0 ;
  for ( long k : m . keySet ( ) ) {
    if ( k == 0 ) {
      long t = m . get ( k ) ;
      ans += t * ( t + 1 ) / 2 ;
    }
    else {
      long t = m . get ( k ) ;
      ans += t * ( t - 1 ) / 2 ;
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; long [ ] A = new long [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { A [ i ] = sc . nextLong ( ) ; } sc . close ( ) ; long [ ] b = new long [ N + 1 ] ; for ( int i = 0 ; i < N ; i ++ ) { b [ i + 1 ] = b [ i ] + A [ i ] ; } Map < Long , Long > m = new TreeMap < Long , Long > ( ) ; for ( int i = 1 ; i <= N ; i ++ ) { m . merge ( b [ i ] , 1l , ( v1 , v2 ) -> ( v1 + v2 ) ) ; } long ans = 0 ; for ( long k : m . keySet ( ) ) { if ( k == 0 ) { long t = m . get ( k ) ; ans += t * ( t + 1 ) / 2 ; } else { long t = m . get ( k ) ; ans += t * ( t - 1 ) / 2 ; } } System . out . println ( ans ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) 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) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (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)))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (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: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier))))))) (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 (type_identifier) (type_identifier))) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)) (decimal_integer_literal) (lambda_expression parameters: (inferred_parameters (identifier) (identifier)) body: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))))))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (enhanced_for_statement type: (integral_type) name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (decimal_integer_literal))))) alternative: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (decimal_integer_literal)))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))