public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  long M = in . nextInt ( ) ;
  long B = in . nextInt ( ) ;
  long max = 0 ;
  for ( long y = B ;
  y >= 0 ;
  y -- ) {
    long x = ( B - y ) * M ;
    long current = y * ( y + 1 ) / 2 * ( x + 1 ) + x * ( x + 1 ) / 2 * ( y + 1 ) ;
    max = Math . max ( max , current ) ;
  }
  System . out . println ( max ) ;
}

public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; long M = in . nextInt ( ) ; long B = in . nextInt ( ) ; long max = 0 ; for ( long y = B ; y >= 0 ; y -- ) { long x = ( B - y ) * M ; long current = y * ( y + 1 ) / 2 * ( x + 1 ) + x * ( x + 1 ) / 2 * ( y + 1 ) ; max = Math . max ( max , current ) ; } System . out . println ( max ) ; }
(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: (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 (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (identifier)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (decimal_integer_literal)) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (decimal_integer_literal)) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (identifier))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))