<?php
// in function.php of your wp theme
function test_shortcode_func( $atts ){
	$a = shortcode_atts( array(
		'value' => 0,
	), $atts );

	$num = (int) $a['value'];

	switch ($num) {
		case $num % 7 === 0:
			if ($num % 11 === 0) {
				return "[LongRead]";
			}else{
				return "[Long]";
			}
			break;
		case $num % 11 === 0:
			if ($num % 7 === 0) {
				return "[Long]";
			}else{
				return "[Read]";
			}
			break;
		default:
			return "[{$num}]";
	}

}
add_shortcode( 'test_shortcode', 'test_shortcode_func' );

/*
[test_shortcode value="5"]
[test_shortcode value="7"]
[test_shortcode value="11"]
[test_shortcode value="77"]
*/