static void find ( int a [ ] , int n ) {
  int count_odd = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( i % 2 != 0 ) {
      count_odd += 1 ;
    }
  }
  int result = ( int ) ( Math . pow ( 2 , n ) - 1 ) ;
  result -= ( Math . pow ( 2 , count_odd ) - 1 ) ;
  System . out . println ( result ) ;
}

static void find ( int a [ ] , int n ) { int count_odd = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( i % 2 != 0 ) { count_odd += 1 ; } } int result = ( int ) ( Math . pow ( 2 , n ) - 1 ) ; result -= ( Math . pow ( 2 , count_odd ) - 1 ) ; System . out . println ( result ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (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: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))))))) (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 (decimal_integer_literal) (identifier))) right: (decimal_integer_literal)))))) (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier))) right: (decimal_integer_literal))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))