made this switching players script but

I have a problem both players 1 and 3 are on at the start how do I fix that

{
    public GameObject Player, Player2, Player3, Player4;


    int whichPlayerIsOn = 1;


    void Start()
    {

        Player.gameObject.SetActive(true);
        Player2.gameObject.SetActive(false);
        Player2.gameObject.SetActive(false);
        Player4.gameObject.SetActive(false);


    }

    public void SwitchPlayer()
    {

        switch (whichPlayerIsOn)
        {

            case 1:

                whichPlayerIsOn = 2;

                Player.gameObject.SetActive(false);
                Player2.gameObject.SetActive(true);
                Player3.gameObject.SetActive(false);
                Player4.gameObject.SetActive(false);

                break;

            case 2:

                whichPlayerIsOn = 3;

                Player.gameObject.SetActive(false);
                Player2.gameObject.SetActive(false);
                Player3.gameObject.SetActive(true);
                Player4.gameObject.SetActive(false);

                break;
            case 3:

                whichPlayerIsOn = 4;

                Player.gameObject.SetActive(false);
                Player2.gameObject.SetActive(false);
                Player3.gameObject.SetActive(false);
                Player4.gameObject.SetActive(true);

                break;

            case 4:

                whichPlayerIsOn = 1;

                Player.gameObject.SetActive(true);
                Player2.gameObject.SetActive(false);
                Player3.gameObject.SetActive(false);
                Player4.gameObject.SetActive(false);

                break;

        }

    }
}

Look at line 13.

fixed