public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  long K = sc . nextLong ( ) ;
  long [ ] A = new long [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    A [ i ] = sc . nextLong ( ) ;
  }
  int [ ] oneBitNums = new int [ MAX_BIT + 1 ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    for ( int j = 0 ;
    j <= MAX_BIT ;
    j ++ ) {
      if ( ( A [ i ] >> j & 1 ) == 1 ) {
        oneBitNums [ j ] ++ ;
      }
    }
  }
  int [ ] xBits = new int [ MAX_BIT + 1 ] ;
  for ( int i = MAX_BIT ;
  i >= 0 ;
  i -- ) {
    if ( oneBitNums [ i ] <= N / 2 ) {
      xBits [ i ] = 1 ;
    }
  }
  long X = 0 ;
  for ( int i = MAX_BIT ;
  i >= 0 ;
  i -- ) {
    if ( xBits [ i ] == 1 ) {
      long num = ( long ) Math . pow ( 2.0 , i ) ;
      if ( X + num <= K ) {
        X += num ;
      }
    }
  }
  long ans = 0 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    ans += X ^ A [ i ] ;
  }
  out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; long K = sc . nextLong ( ) ; long [ ] A = new long [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { A [ i ] = sc . nextLong ( ) ; } int [ ] oneBitNums = new int [ MAX_BIT + 1 ] ; for ( int i = 0 ; i < N ; i ++ ) { for ( int j = 0 ; j <= MAX_BIT ; j ++ ) { if ( ( A [ i ] >> j & 1 ) == 1 ) { oneBitNums [ j ] ++ ; } } } int [ ] xBits = new int [ MAX_BIT + 1 ] ; for ( int i = MAX_BIT ; i >= 0 ; i -- ) { if ( oneBitNums [ i ] <= N / 2 ) { xBits [ i ] = 1 ; } } long X = 0 ; for ( int i = MAX_BIT ; i >= 0 ; i -- ) { if ( xBits [ i ] == 1 ) { long num = ( long ) Math . pow ( 2.0 , i ) ; if ( X + num <= K ) { X += num ; } } } long ans = 0 ; for ( int i = 0 ; i < N ; i ++ ) { ans += X ^ A [ i ] ; } 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)))) (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)))))) (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 (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: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)) right: (decimal_integer_literal))) right: (decimal_integer_literal))) consequence: (block (expression_statement (update_expression (array_access array: (identifier) index: (identifier)))))))))) (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: (identifier))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) 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: (identifier))) condition: (binary_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_floating_point_literal) (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: (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 (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))))))