public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  long n = sc . nextLong ( ) ;
  int k = sc . nextInt ( ) ;
  sc . close ( ) ;
  if ( k == 0 ) {
    System . out . println ( n * n ) ;
    return ;
  }
  long ans = ( n - k + 1 ) * ( n - k ) / 2 ;
  for ( int i = k + 1 ;
  i < n ;
  i ++ ) {
    long tmp = ( ( n - i ) / i ) * ( i - k ) ;
    if ( n % i >= k ) {
      tmp += n % i - k + 1 ;
    }
    ans += tmp ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; long n = sc . nextLong ( ) ; int k = sc . nextInt ( ) ; sc . close ( ) ; if ( k == 0 ) { System . out . println ( n * n ) ; return ; } long ans = ( n - k + 1 ) * ( n - k ) / 2 ; for ( int i = k + 1 ; i < n ; i ++ ) { long tmp = ( ( n - i ) / i ) * ( i - k ) ; if ( n % i >= k ) { tmp += n % i - k + 1 ; } ans += tmp ; } 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: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier))))) (return_statement))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier)))) right: (decimal_integer_literal)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (identifier) right: (decimal_integer_literal)))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (identifier))) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier)) right: (decimal_integer_literal)))))) (expression_statement (assignment_expression left: (identifier) right: (identifier))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))