my $location = $output_dir;
print $location;
open LOGFILE, $location;
my $first_line = 1;
print $first_line;
my $max_id;

while (<LOGFILE>) {
    if (/rev(\d+)/) {
        if ($first_line) {
            $first_line = 0;
            print $first_line;
            $max_id = $1;
            print $max_id;
            
        } else {
            $max_id = $1 if ($1 > $max_id);
            print $max_id;
        }
    }
}

close LOGFILE;