How to code Range of Last 5 Session

Hi, when I use multicharts I write a code like this:

range5d = maxlist(highd1, highd2, highd3, highd4, highd5) – minlist(lowd1, lowd2, lowd3, lowd4, lowd5);

Could someone advise me how can I writhe this on my custom block?

You can nest Min / Max functions in many steps. See the image attached