How many Mars sized planets can form and remain stable in the habitable zone of a Sun-like star?

By Mars sized I mean with masses between 0.10 (M_âŠ•) and 0.25 (M_âŠ•), the planets need to have independent orbits around the star. We can assume the habitable zone stretches from 0.70 AU, to 1.5 AU for a typical G type star like the Sun. I don't know if adding a gas giant to the system will cause instabilities, but I think they are important for perturbing comets and other volatiles to terrestrial planets.

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How many Mars sized planets can form and remain stable in the habitable zone of a Sun-like star?

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