public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int h = in . nextInt ( ) ;
  int w = in . nextInt ( ) ;
  int x = in . nextInt ( ) ;
  int c = 0 ;
  if ( x == 1 ) {
    c = c + ( h * 2 + w * 2 ) ;
    c = c - 4 ;
  }
  else if ( x > 1 ) {
    for ( int i = 1 ;
    i <= x ;
    i ++ ) {
      c = c + ( h * 2 + w * 2 ) ;
      c = c - 4 ;
      h = h - 4 ;
      w = w - 4 ;
    }
  }
  System . out . println ( c ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int h = in . nextInt ( ) ; int w = in . nextInt ( ) ; int x = in . nextInt ( ) ; int c = 0 ; if ( x == 1 ) { c = c + ( h * 2 + w * 2 ) ; c = c - 4 ; } else if ( x > 1 ) { for ( int i = 1 ; i <= x ; i ++ ) { c = c + ( h * 2 + w * 2 ) ; c = c - 4 ; h = h - 4 ; w = w - 4 ; } } System . out . println ( c ) ; }
(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)))) (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: (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (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: (identifier) right: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))