public static void main ( String [ ] args ) throws IOException {
  BufferedReader f = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  PrintWriter out = new PrintWriter ( System . out ) ;
  StringTokenizer st = new StringTokenizer ( f . readLine ( ) ) ;
  int numKayaks = Integer . parseInt ( st . nextToken ( ) ) * 2 ;
  int [ ] diff = new int [ numKayaks ] ;
  st = new StringTokenizer ( f . readLine ( ) ) ;
  for ( int i = 0 ;
  i < numKayaks ;
  i ++ ) {
    diff [ i ] = Integer . parseInt ( st . nextToken ( ) ) ;
  }
  Arrays . sort ( diff ) ;
  int min = Integer . MAX_VALUE ;
  for ( int i = 0 ;
  i < numKayaks ;
  i ++ ) {
    for ( int j = i + 1 ;
    j < numKayaks ;
    j ++ ) {
      int sum = 0 ;
      int index = - 1 ;
      for ( int k = 0 ;
      k < numKayaks ;
      k ++ ) {
        if ( k == i || k == j ) {
          continue ;
        }
        else if ( index == - 1 ) {
          index = k ;
        }
        else {
          sum += diff [ k ] - diff [ index ] ;
          index = - 1 ;
        }
      }
      min = Math . min ( min , sum ) ;
    }
  }
  out . println ( min ) ;
  out . close ( ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader f = new BufferedReader ( new InputStreamReader ( System . in ) ) ; PrintWriter out = new PrintWriter ( System . out ) ; StringTokenizer st = new StringTokenizer ( f . readLine ( ) ) ; int numKayaks = Integer . parseInt ( st . nextToken ( ) ) * 2 ; int [ ] diff = new int [ numKayaks ] ; st = new StringTokenizer ( f . readLine ( ) ) ; for ( int i = 0 ; i < numKayaks ; i ++ ) { diff [ i ] = Integer . parseInt ( st . nextToken ( ) ) ; } Arrays . sort ( diff ) ; int min = Integer . MAX_VALUE ; for ( int i = 0 ; i < numKayaks ; i ++ ) { for ( int j = i + 1 ; j < numKayaks ; j ++ ) { int sum = 0 ; int index = - 1 ; for ( int k = 0 ; k < numKayaks ; k ++ ) { if ( k == i || k == j ) { continue ; } else if ( index == - 1 ) { index = k ; } else { sum += diff [ k ] - diff [ index ] ; index = - 1 ; } } min = Math . min ( min , sum ) ; } } out . println ( min ) ; out . close ( ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))))) (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: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (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: (identifier) right: (object_creation_expression type: (type_identifier) arguments: (argument_list (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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))))) (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)))) (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 (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: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (unary_expression operand: (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: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (block (continue_statement)) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (unary_expression operand: (decimal_integer_literal)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (identifier)))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (array_access array: (identifier) index: (identifier))))) (expression_statement (assignment_expression left: (identifier) right: (unary_expression operand: (decimal_integer_literal))))))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (identifier))))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))