I try to find relationship between beer and Shakespeare's poem. 
print "How much beer do you whant? ";
my $beer=<STDIN>;chomp($beer);
$question = (2 * $beer) || (not 2 * $beer);
print "2 beer || ! 2 beer this is a $question\n";

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in this case the $beer is continual, but i fogot about another variable: my purse. so now i have more realistic situation : 
my $mymoney=10; $beercost=1;
while($mymoney>0){
    print "How much beer do you whant? ";
    my $beer=<STDIN>;chomp($beer);
    $question = (2 * $beer) || (not 2 * $beer);
    print "2 beer || ! 2 beer this is a $question\n";
    $mymoney-=$beercost*$question;    
}

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P.S. Sorry for my bad english

In reply to Shakespeare by UrsaloFF

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