how to create powershell script to add user to AD that will allow variables.

I have a script to add a user account to AD but I need it to be accomplished with variables.  This is my script.

New-ADUser -SamAccountName blah -Name "blah" -AccountPassword (ConvertTo-SecureString -AsPlainText "somePassword" -Force) -Enabled $true -PasswordNeverExpires $true -Path 'CN=Users,DC=slacker,DC=jeans,DC=net'

The issue I am having is with the Path.   I need to use variable to do this because the domain will not be the same all the time.   it might be or it could be    I need to have users be able to plug in the variable and run the script to add the user account.  

I created  some variables.

# API | parameter | Domain | label: Domain | default-value: slacker
# API | parameter | 2Domain | label: 2Domain | default-value:jeans
# API | parameter | 3Domain | label: 3Domain | default-value: net
# API | parameter | Users | label: Users | default-value: CN=Users
# API | gap

param (

This allows users to put in the variables they want.   if they are not in the domain they can change it and run the script to add the user.  

Here is my PS

New-ADUser -SamAccountName blah -Name "blah" -AccountPassword (ConvertTo-SecureString -AsPlainText "somePassword" -Force) -Enabled $true -PasswordNeverExpires $true -Path CN= $Users, DC=$Domain, DC=$2Domain, DC=$3Domain  -enabled $true

My problem is I cannot get the Path to take the variables.  it doesn't like syntax.   Any ideas how to do this?????
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The -path parameter needs a string.  The following should work.

New-ADUser -SamAccountName blah -Name "blah" -AccountPassword (ConvertTo-SecureString -AsPlainText "somePassword" -Force) -Enabled $true -PasswordNeverExpires $true -Path "CN= $Users,DC=$Domain,DC=$2Domain,DC=$3Domain"  -enabled $true

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gmckfnAuthor Commented:
is there a way to add the whole FQDN to the powershell script instead of putting in 3 parameters for the path??  

that way users can input on one line instead of using parameters for each DC=??
You can do just about anything, but I don't really have a good idea of all the variations that you want to be able to submit and have handled, and/or where accounts should then be created.  This should work for creating accounts in the default Users container of the specified domain.
param (
$pathDN = "CN=Users,DC=$($Domain -replace "\.",",DC=")"
New-ADUser -SamAccountName blah -Name "blah" -AccountPassword (ConvertTo-SecureString -AsPlainText "somePassword" -Force) -Enabled $true -PasswordNeverExpires $true -Path $pathDN  -enabled $true

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