Problem with adsense script

Hi everyone,
Having an issue here with my wordpress site. My header aread has a place for me to paste my adsense code in. Everytime I paste it in, I get an error on the first line saying:

Expected an identifier and instead saw ‘<‘.
Missing “;” before statement
Unclosed regular expression
Unrecoverable syntax error.

<script async src=”//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js”></script>
<!– ad3 –>
<ins class=”adsbygoogle”
style=”display:inline-block;width:728px;height:90px”
data-ad-client=”ca-pub-8387989166701388″
data-ad-slot=”7323577752″></ins>
<script>
(adsbygoogle = window.adsbygoogle || []).push({});
</script>

This is driving me nuts, I coped the code directly from google adsense, I also manually typed it in to see if it would make a difference. No luck. Any help would be insanely appreciated!