Римские цифры на перле

#!/usr/bin/perl

@nums = (1,4,5,9,10,40,50,90,100,400,500,900,1000,
                      'I','IV','V','IX','X','XL','L','XC','C','CD','D','CM','M');

$cnt = 1999; $rn = "-> ";

$n = 12;
while($cnt > 0) {
    while($nums[$n] > $cnt) {$n--;}
    while($nums[$n] < = $cnt){
 $rn .= $nums[$n+13];
 $cnt -= $nums[$n];
    };
}
print "\n", $rn, "\n";