#
eval 'exec perl $0 $*'
    if 0;

$path = shift;
$newpath = rmdd($path);

while ($path ne $newpath) {
    $path = $newpath;
    $newpath = rmdd($path);
}

print $newpath;

sub rmdd {
    my $path = shift;
    $path =~ s/\/[^\/.]*\/\.\.//;
    return $path;
}