I want to add some ads in product thumbnails. I added the code in wc-template.php in wc-content function. But I dont see any ads. Where should I add the google ads php code? in index.php? content.php? or anywhere else?

Modified Code:
if ( ! function_exists( ‘woocommerce_content’ ) ) {

/**
* Output WooCommerce content.
*
* This function is only used in the optional ‘woocommerce.php’ template.
* which people can add to their themes to add basic woocommerce support.
* without hooks or modifying core templates.
*/
function woocommerce_content() {
$i=1;
if ( is_singular( ‘product’ ) ) {

while ( have_posts() ) :
the_post();

if($i==5||$i==7||$i==10){?>
#my adsense code
<?php }

wc_get_template_part( ‘content’, ‘single-product’ );
$i++;
endwhile;

} else {
?>

<?php if ( apply_filters( ‘woocommerce_show_page_title’, true ) ) : ?>

<h1 class=”page-title”><?php woocommerce_page_title(); ?></h1>

<?php endif; ?>

<?php do_action( ‘woocommerce_archive_description’ ); ?>

<?php if ( woocommerce_product_loop() ) : ?>

<?php do_action( ‘woocommerce_before_shop_loop’ ); ?>

<?php woocommerce_product_loop_start(); ?>

<?php if ( wc_get_loop_prop( ‘total’ ) ) : ?>
<?php $i++; while ( have_posts() ) : ?>
<?php the_post(); ?>

<?php if($i==5||$i==7||$i==10){?>
#my adsense code
<?php }?>

<?php wc_get_template_part( ‘content’, ‘product’ ); ?>
<?php $i++;?>
<?php endwhile; ?>

Have added the example image. I need ads in that fashion.