Detailed Instructions: Given a travel related situation, and given a specific question about the situation, summarize the question into a title
Problem:I am currently in Saint Petersburg on a tourist visa (I'm French). I arrived on Tuesday and I'm leaving on Wednesday morning, so I will be a total of 7 working days in Russia, including the arrival and departure days.
I assumed I wouldn't need to register my visa, so I didn't, and neither the hostel where I'm staying nor my sponsor told me anything about it either.

Now I just noticed that because of the world cup the rules have changed, and I was actually supposed to register it within 24 hours, so it's obviously too late now.

What should I do? Should I go try to register it anyway before leaving (and pay whatever fine there is) or should I just forget about it and hope they won't care? Is there a risk they will prevent me from leaving Russia?

In case that matters, I will be leaving by train to Finland (and on the last day of my visa).

Solution:
I did not register my Russian visa, what should I do?