public static void main ( String args [ ] ) {
  FastScanner input = new FastScanner ( ) ;
  int n = input . nextInt ( ) ;
  int k = input . nextInt ( ) * 2 ;
  int a [ ] = new int [ n * 2 ] ;
  int j = 1 ;
  for ( int i = 0 ;
  i < 2 * n ;
  i += 2 , j ++ ) {
    a [ i ] = ( j ) * 2 ;
    a [ i + 1 ] = ( j ) * 2 - 1 ;
  };
}

public static void main ( String args [ ] ) { FastScanner input = new FastScanner ( ) ; int n = input . nextInt ( ) ; int k = input . nextInt ( ) * 2 ; int a [ ] = new int [ n * 2 ] ; int j = 1 ; for ( int i = 0 ; i < 2 * n ; i += 2 , j ++ ) { a [ i ] = ( j ) * 2 ; a [ i + 1 ] = ( j ) * 2 - 1 ; } ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_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: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (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: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (identifier))) update: (assignment_expression left: (identifier) right: (decimal_integer_literal)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (binary_expression left: (parenthesized_expression (identifier)) right: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (binary_expression left: (binary_expression left: (parenthesized_expression (identifier)) right: (decimal_integer_literal)) right: (decimal_integer_literal))))))))