I drove my nissan micra with the handbrake on 0.3miles what would be the maximum cost of damage i will have caused to my car?

I drove my nissan micra (x reg) with the handbrake on today for about 0.3miles. the handbrake holds ok on my hill however it is not a very steep hill. what would be the maximum cost of damage i will have caused to my car? im really worried i will have done some serious damage i wont be able to afford to fix. this is my first car and only got it yesterday and it was my 2nd time driving since my test so didnt know the feel of the car at all and its VERY different from the one i learnt in!