Space on cluster

$vCener = Read-Host "Give me the vCenter name to login:-"
$pass = Get-Credential
connect-viserver $vCener -Credential $pass
$Datastores33 = Get-View -ViewType datastore
$z = 0 
$y = 0 
$a = 0 
$b = 0 
$c = 0 
$u = 0
foreach ($Datastores100 in $Datastores33)
{
$u = 1 + $u
$OutputDatastores101 += @($Datastores100 | Select-Object Name, @{N="Type";E={$Datastores100.Summary.Type}},
@{N="Capacity_inGB";E={[math]::Round($Datastores100.Summary.Capacity/1GB,0)}},
@{N="Free_space";E={[math]::Round($Datastores100.Summary.Freespace/1GB,0)}},
@{N="Percentage_free";E={[math]::Round(($Datastores100.Summary.Freespace/$Datastores100.Summary.Capacity)*100,0)}})
$jj = [math]::Round($Datastores100.Summary.Capacity/1GB,0)
$gg = [math]::Round($Datastores100.Summary.Freespace/1GB,0)
$hh = [math]::Round(($Datastores100.Summary.Freespace/$Datastores100.Summary.Capacity)*100,0)
If ($jj -le 500 )
{
$z = 1 + $z
}
If ($hh -le 20 )
{
$y = 1 + $y
}
If ($gg -le 5 )
{
$a = 1 + $a
}
If ($hh -gt 70 )
{
$b = 1 + $b
}
If ($jj -gt 800 )
{
$c = 1 + $c
}
}
Write-Output $global:DefaultVIServer
Write-Output "The number of Data store in the vCenter = $u"
Write-Output "The number of Data store having less than 500GB as per capacity = $z"
Write-Output "The number of Data store having more than 800GB as per capacity = $c"
Write-Output "The number of Data store having less than required buffer space(20%) = $y"
Write-Output "The number of Data store having less than 5GB free space = $a"
Write-Output "The number of Data store having more than 70% free space = $b"
$OutputDatastores101 | Export-Csv # provide the path
Disconnect-VIServer $vCener -Confirm:$false