public static void main ( String [ ] args ) throws FileNotFoundException {
  Scanner sc = new Scanner ( System . in ) ;
  PrintWriter pw = new PrintWriter ( System . out ) ;
  int a = sc . nextInt ( ) ;
  int b = sc . nextInt ( ) ;
  int minutes = 0 ;
  if ( a == 1 && b == 1 ) {
    System . out . println ( 0 ) ;
    return ;
  }
  for ( ;
  a > 0 && b > 0 ;
  minutes ++ ) {
    if ( a > b ) {
      a = a - 2 ;
      b ++ ;
    }
    else {
      b = b - 2 ;
      a ++ ;
    }
  }
  System . out . println ( minutes ) ;
}

public static void main ( String [ ] args ) throws FileNotFoundException { Scanner sc = new Scanner ( System . in ) ; PrintWriter pw = new PrintWriter ( System . out ) ; int a = sc . nextInt ( ) ; int b = sc . nextInt ( ) ; int minutes = 0 ; if ( a == 1 && b == 1 ) { System . out . println ( 0 ) ; return ; } for ( ; a > 0 && b > 0 ; minutes ++ ) { if ( a > b ) { a = a - 2 ; b ++ ; } else { b = b - 2 ; a ++ ; } } System . out . println ( minutes ) ; }
(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 (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: (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: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (decimal_integer_literal)))) (return_statement))) (for_statement condition: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (update_expression (identifier)))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (expression_statement (update_expression (identifier))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))