public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  int x = in . nextInt ( ) , y = in . nextInt ( ) - 1 ;
  in . close ( ) ;
  System . out . println ( ( y > 0 && x >= y && ( x - y ) % 2 == 0 ) || ( y == 0 && x == y ) ? "Yes" : "No" ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; int x = in . nextInt ( ) , y = in . nextInt ( ) - 1 ; in . close ( ) ; System . out . println ( ( y > 0 && x >= y && ( x - y ) % 2 == 0 ) || ( y == 0 && x == y ) ? " Yes " : " No " ) ; }
(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))) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (ternary_expression condition: (binary_expression left: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (identifier))) right: (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)) right: (decimal_integer_literal)))) right: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (identifier))))) consequence: (string_literal) alternative: (string_literal)))))))