Alas, all this is good only if the apartment was flooded once, with multiple flooding, it is necessary to solve the problem in a different way.
Advice! Even if you are in good relations with your neighbors and all the agreements have been achieved, which is called “amicably”, be sure to call the representatives of the housing office and draw up an act of the fact of the flow of water to your apartment from the upper floor, with a complete indication of damage. This can help if suddenly, at some stage, neighbors change their minds to pay compensation or want to underestimate this amount.