Check if data in table is duplicated

Sub check()

Dim ws As Worksheet
Set ws = ThisWorkbook.Worksheets("History")

Dim ws2 As Worksheet
Set ws2 = ThisWorkbook.Worksheets("Result")

Dim i As Long, j As Integer, k As Integer

i = 2
j = 0
k = 1

Do While ws.Cells(i, 3).Value <> ""
If ws.Cells(i, 3).Value = ws.Cells(i - 1, 3).Value Then
j = j + 1

Else

j = 0

End If

If j > 1 Then
ws2.Cells(k, 1).Value = ws.Cells(i, 3).Value
k = k + 1
End If
i = i + 1
Loop

Sheets("Result").Select
Columns("A:A").Select

' delete duplicate data
ActiveSheet.Range("$A$1:$A$5000").RemoveDuplicates Columns:=1, Header:=xlNo

MsgBox "End"



End Sub