Project Euler and PowerShell - Problem 2

This is a continuation of my efforts to use PowerShell to solve some of the problems at Project Euler.

Problem 2: Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:

1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ...

Find the sum of all the even-valued terms in the sequence which do not exceed four million.

function Get-SumFib ($n)
{
 $current = $previous = 1 
 while ($current -lt $n)
 {
     if($current%2 -eq 0)
     {
         $sum= $sum + $current
     }
  
     $current,$previous = ($current + $previous),$current}
 $sum 
}
Get-Fib 4000000