Удалить повторы со сложением значений (Microsoft Office Excel)

Sub DoSomething()
    Dim iLastRow As Integer
    Dim i As Integer
    iLastRow = Cells(Rows.Count, "A").End(xlUp).Row
    
    For i = iLastRow - 1 To 2 Step -1
        If Cells(i + 1, "A") = Cells(i, "A") Then
            Cells(i, "D") = Cells(i + 1, "D") + Cells(i, "D")
            Rows(i + 1).Delete
        End If
    Next i
    MsgBox "DONE"
End Sub