Pagination $paged query /code addresing specific page number

I wrote following code in order to insert adverts on specific pages:

<?php
$paged = (get_query_var('page')) ? get_query_var('page') : 1;
if (is_single( array( XX )) && 2 == $paged ) {
	echo CODE;
}
elseif (is_single( array( XX )) && 4 == $paged ) {
	echo CODE;
}
elseif (is_single( array( XX )) && 6 == $paged ) {
	echo CODE;
}
else {
	echo "";
}
?>

The code works perfect up to page number 5, but then it stops working.

Also tried $paged > 5, but this doesn’t help either.

Any ideas what may be wrong?
Thanks for all your help!