HTTPS www redirects in web.config

I have the following in my web.config to force https;

<rule name="Redirect to https" stopProcessing="true">
<match url="(.*)" />
<conditions>
<add input="{HTTPS}" pattern="off" ignoreCase="true" />
</conditions>
<action type="Redirect" url="https://{HTTP_HOST}{REQUEST_URI}" redirectType="Permanent" appendQueryString="false" />
</rule>

But I want to force the www. as well, so that all of these would go to the https://www version. Please can someone help with what needs to change here?

http://ift.tt/2DndcI9
http://ift.tt/2p99bUM
http://ift.tt/2Dqf3vY

Thank you.