Clonazepam dosage question

I've been prescribed clonazepam: those pills are 2mg and they can be broken into two pieces or four pieces; i just took a quarter of it but im not sure if it means that i've taken 0.5mg or less? Can anyone help me figure out how much would one of those quarters be in mgs?

I can also say that im not feeling anything at the moment: doesn't feel like i've taken anything and im still kinda anxious..

I have no real tolerance as i take benzos only when i need them