If I ate several burekas or pizza, do I need to recite Birkat Hamazon?

Hello and blessings

If one eats about 4 large slices, Birkat Hamazon is recited.

For burekas, the required amount is very large.

After any food such as fruits, vegetables, and the like, anything whose initial blessing is not mezonot, hamotzi, or hagafen, and which is also not from the seven species, the concluding blessing is Borei Nefashot.

With blessings - Benjamin Shmueli