The task of the communal kitchen

Morning in the communal kitchen. To cook breakfast, Neighbor Troikina threw 3 logs into a common pot. Neighbor Pyaterkina threw 5 logs into a common pot. A neighbor Bespolenov, you guessed it, for lack of logs did not throw anything in the pot. However, the neighbors kindly allowed him to use a common boiler. After that, in compensation, Bezpolenov paid 80 kopecks to the neighbors.

Question: how should the neighbors share the money they received?

As always, in order to avoid spoilers, please write answers to white.
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PS In order to avoid ambiguity and care in the direction of “who cooked for how long” I will also make the following addition: breakfast on the boiler is cooked in common of common products. Thus, the neighbors need only equalize their "contributions" to the boiler (and not to what is being prepared in it and for how long). But how - this is the problem.