#!/usr/bin/perl

use strict;
use warnings;

my $l = <>;
my $n = <>;
my $str = <>;
my $ans;

if($l == 3) {
	print "$n\n";
} else {
	$ans = $l - 3;
	$ans = 2**$ans;
	$ans *= $n;
	print "$ans\n";
}

exit;