public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) + 1 ;
  long [ ] nums = new long [ n ] ;
  nums [ 0 ] = 0 ;
  long output = 0 ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    nums [ i ] = sc . nextInt ( ) ;
  }
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    nums [ i ] += nums [ i - 1 ] ;
  }
  Arrays . sort ( nums ) ;
  long tmp = Integer . MIN_VALUE ;
  int outtmp = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( tmp == nums [ i ] ) {
      outtmp ++ ;
      if ( i == n - 1 ) {
        i -- ;
        tmp = Integer . MIN_VALUE ;
      }
    }
    else {
      if ( outtmp > 1 ) {
        output += nc2 ( outtmp ) ;
      }
      tmp = nums [ i ] ;
      outtmp = 1 ;
    }
  }
  System . out . println ( output ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) + 1 ; long [ ] nums = new long [ n ] ; nums [ 0 ] = 0 ; long output = 0 ; for ( int i = 1 ; i < n ; i ++ ) { nums [ i ] = sc . nextInt ( ) ; } for ( int i = 1 ; i < n ; i ++ ) { nums [ i ] += nums [ i - 1 ] ; } Arrays . sort ( nums ) ; long tmp = Integer . MIN_VALUE ; int outtmp = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( tmp == nums [ i ] ) { outtmp ++ ; if ( i == n - 1 ) { i -- ; tmp = Integer . MIN_VALUE ; } } else { if ( outtmp > 1 ) { output += nc2 ( outtmp ) ; } tmp = nums [ i ] ; outtmp = 1 ; } } System . out . println ( output ) ; }
(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: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) (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))))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (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: (identifier)) right: (method_invocation object: (identifier) name: (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 (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (field_access object: (identifier) field: (identifier)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (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 (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) consequence: (block (expression_statement (update_expression (identifier))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (expression_statement (update_expression (identifier))) (expression_statement (assignment_expression left: (identifier) right: (field_access object: (identifier) field: (identifier))))))) alternative: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation name: (identifier) arguments: (argument_list (identifier))))))) (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))