Visual Basic call a sub

Visual Basic call a sub

I am teaching myself VB and am trying to call the sub Main() however, when
I include it after the End Sub it says Syntax error and when I run it
without calling, nothing happens. Please could you explain to me what I am
doing wrong and how to call the sub.
Imports System.IO
Public Class Form1
Sub Main()
HouseCalc(99800, 43100)
Call HouseCalc(380950, 49500)
End Sub
Sub HouseCalc(price As Single, wage As Single)
If 2.5 * wage <= 0.8 * price Then
MsgBox("You cannot afford this house.")
Else
MsgBox("This house is affordable.")
End If
End Sub
End Class
Thanks, Marcus