adding stat counter

Hi, I wanted to add an invisible stat counter to my wordpress blog but i can’t figure out where to put the code. i am using the code generated by statcounter.com

the code is here below:

<!-- Start of StatCounter Code -->
<script type="text/javascript" language="javascript">
var sc_project=1910178;
var sc_invisible=1;
var sc_partition=17;
var sc_security="7a013124";
</script>

<script type="text/javascript" language="javascript" src="https://www.statcounter.com/counter/counter.js"></script><noscript><a href="https://www.statcounter.com/"><img src="https://c18.statcounter.com/counter.php?sc_project=1910178&java=0&security=7a013124&invisible=1" alt="best website stats" border="0"></a> </noscript>
<!-- End of StatCounter Code -->

can anyone tell me where to insert this?
thanks!