static int calculateSum ( int n ) {
  int r1 = 2 , r2 = 3 ;
  int a1 = 1 , a2 = 1 ;
  return ( int ) ( a1 * ( Math . pow ( r1 , n ) - 1 ) / ( r1 - 1 ) + a2 * ( Math . pow ( r2 , n ) - 1 ) / ( r2 - 1 ) ) ;
}

static int calculateSum ( int n ) { int r1 = 2 , r2 = 3 ; int a1 = 1 , a2 = 1 ; return ( int ) ( a1 * ( Math . pow ( r1 , n ) - 1 ) / ( r1 - 1 ) + a2 * ( Math . pow ( r2 , n ) - 1 ) / ( r2 - 1 ) ) ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (return_statement (cast_expression type: (integral_type) value: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (identifier))) right: (decimal_integer_literal)))) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) right: (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (identifier))) right: (decimal_integer_literal)))) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))))))))