sub isprime($) {
    my $num = $_[1];
    $primer = 1;
    $ValidChars = "2357";
    $str = $num;
    if (index($ValidChars, ord(substr $str, 0, 1)) == 1) {
        $primer = 0;
    }
    return $primer;
}
##</code><code>##

sub isprime {$_[0] =~ /^[2357]$/}

##</code><code>##

if (($n != 1) && ($n != 0)) {
   if (isprime($n)) {
      $prime += $n;
   }
   if (!isprime($n)) {
      $comp += $n;
   }
}

##</code><code>##

if ($n =~ /^[2357]$/) {
    $prime += $n;
}
elsif ($n !~ /^[01]$/) {
    $comp += $n;
}

##</code><code>##

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