How do I PopModalAsync a few pages back?

Hi,
I have navigated to few pages (in the stack) by using PushModalAsync . How do I go back to the 1st page (by just a click from the last page)?

Example:
Page 1 -> Page 2 -> Page 3 -> Page 4 -> Page 1 ?

How do I go back to Page 1?

I'd tried on the below, but it only gets me back to Page 3

Any help is greatly appreciated.

        private async void Goback(object sender, EventArgs e)
        {
            await Navigation.PopModalAsync();
            await Navigation.PopModalAsync();
            await Navigation.PopModalAsync();
        }

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