Formel aud Zeile kopieren

Sub Makro1()
Dim Zeilen As Variant
Zeilen = InputBox("Anzahl der Zeilen:")
If Zeilen = "" Then Exit Sub
Rows(ActiveCell.Row & ":" & ActiveCell.Row + Zeilen - 1).Insert
Range(Cells(ActiveCell.Row, ActiveCell.Column), _
Cells(ActiveCell.Row + Zeilen - 1, ActiveCell.Column)) _
.FormulaR1C1 = Cells(1, ActiveCell.Column).FormulaR1C1
End Sub