Add server count in powershell

This should work. I'm assuming you want it added to the e-mail somehow, this adds it as a paragraph above the table.

$diskSpaceReport =  Get-WmiObject Win32_LogicalDisk -Filter "DriveType=3" -Computer (Get-Content .\computer.csv) -ErrorAction silentlycontinue |
    Select-Object SystemName,
                  DeviceID,
                  @{Name="Free (%)";Expression={"{0:N0}" -f (($_.freespace /1gb) / ($_.size /1gb) * 100) }},
                  @{Name="Size (GB)";Expression={"{0:N1}" -f($_.size/1gb)}},
                  @{Name="Free (GB)";Expression={"{0:N1}" -f($_.freespace/1gb)}} 

$body = @('<p>Disk space report for {0} servers.</p>' -f ($diskSpaceReport | Group-Object SystemName -NoElement | Measure-Object).Count)
$body += $diskSpaceReport | ConvertTo-Html -Fragment

# Remove the extra table added by generating content like this.
$document = (ConvertTo-Html -Body $body | Out-String) -replace '<table>\r?\n</table>\r?\n'

Send-MailMessage -SmtpServer mail1.abc.com -From backupserver@abc.com -To admin@abc.com -Subject 'Servers Disk Space Analysis' -Body $document -BodyAsHtml

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What's the purpose for the following line ? What does it perform ? I have taken out the replace string and I can see the result without problem...  Thx

 $document = (ConvertTo-Html -Body $body | Out-String) -replace '<table>\r?\n</table>\r?\n'

Thx

Thanks as well Chris.