Option Explicit
Public Sub InsertRows()
Dim i As Long
Dim j As Integer
j = Application.InputBox("Please specify number of rows to be inserted e.g. 1,2,3 etc", _
"InsertRow", 1, , , , , 1)
Application.ScreenUpdating = False
For i = Range("A" & Rows.Count).End(xlUp).Row To 2 Step -1
Range("A" & i).Resize(j, 1).EntireRow.Insert xlDown
Next i
Application.ScreenUpdating = True
End Sub