Input Between Strings

Hey quick question!

I am trying to input a folder name that will be inputed by the user when the script starts to obtain the correct location for the file.

For example

$Input = InputBox("File","Please enter the Folder Name")
$File2 = "C:\Program Files (x86)\$Input\Examples\_ReadMe_.txt"

In this example I would input AutoIt3 if I was the user and then my input would be stored in $Input which would be used in the file location. However, I can't seem to get it to work. I'm not sure how to declare variables between two different strings.

I've tried doing this.

$File2 = "C:\Program Files (x86)\" + $Input + "\Examples\_ReadMe_.txt"

But that didn't work either! Sorry I'm still fairly new to AutoIt, so any help would be great. Thanks! Let me know if you need more info also!