Hello. I think codeforces contribution calculation system so complicated.I don't know how it is calculated. Can anyone tell me ? Is there any formulas or something else just like rating change system ? Sometimes I see that some of my comments has +45 contribution, but my contribution increases only 4-5 and sometimes +3/+4 changes the main contribution more than that. Suppose, I get downvote(suppose -x) in a comment, but my main contribution changes randomly(I think so).

I didn't get any kinds of patterns. What's your opinion about it ? I wonder how it is calculated. If you know anything about it, please inform me, I'll be grateful to you. Thanks in advance.