static long calculateSum ( int n ) {
  long sum = 0 ;
  sum = 1 << n ;
  return ( sum - 1 ) ;
}

static long calculateSum ( int n ) { long sum = 0 ; sum = 1 << n ; return ( sum - 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))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (decimal_integer_literal) right: (identifier)))) (return_statement (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))))