static int sum ( int k , int n ) {
  int sum = ( int ) ( Math . pow ( k , n + 1 ) - Math . pow ( k - 1 , n + 1 ) ) ;
  return sum ;
}

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