Public Function Ackermann(m As Float, n As Float) As Float
  If m = 0 Then
    Return n + 1
  End If
  If n = 0 Then
    Return Ackermann(m - 1, 1)
  End If
  Return Ackermann(m - 1, Ackermann(m, n - 1))
End

Public Sub Main()
  Dim m, n As Float
  For m = 0 To 3
    For n = 0 To 4
      Print "Ackermann("; m; ", "; n; ") = "; Ackermann(m, n)
    Next
  Next
End