Sum of IF in cell N84

Dear all, please, I would like to simplify this formula anyhow, but I have no idea how.
It says - =if($E8="BBS";$AL8*N8;0) and goes 60 times for each new line. I assume throuhg sumifs, it should be easier, but how? It could be done by extra sheets where "al*n" will be calculated for each month, but I do not would like to add any extra cells.
Please help to rearange N84 (should be copy-able to P84 as well as to N85).