Law / Obtaining citizenship while working in Poland [3]

Greetings! I'm from Lutsk and I've been working in Rzeszow for 3 months at the construction site. And you know... I've found out that in Poland the government treats to its citizens much better than in Ukraine! Unlike me, my local colleagues have good social benefits and salaries. Besides food is much cheaper!

Can you tell me where I should go to obtain Polish citizenship? Can I expect any benefits if my grandmother and grandfather were Polish citizens??