Copy this code and paste it any where in your file.
Make sure jQuery included in your page.
Make sure jQuery included in your page.

<?php remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_title', 5 ); remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_rating', 10 ); remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_price', 10 ); remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_excerpt', 20 ); remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_meta', 40 ); remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_sharing', 50 ); do_action( 'woocommerce_single_product_summary' ); ?>
<?php
function fantastic3($n) {
$series = array(0,1,1,1);
for($i=3 ; $i<=$n ; $i++){
$a = (isset($series[ (int)$i-3 ]))?$series[ (int)$i-3 ]:0;
$b = (isset($series[ (int)$i-2 ]))?$series[ (int)$i-2 ]:0;
$c = (isset($series[ (int)$i-1 ]))?$series[ (int)$i-1 ]:0;
$d = ($a+$b+$c)-1;
if($d<0){
$d = 0;
}
$series[$i] = $d;
}
echo $series[ (int)$n-1 ];
}
// Do NOT call the fantastic3 function in the code
// you write. The system will call it automatically.
?>