JL$\mathrm{.}61$ A producer of refrigerator compressors wants to implement a just$-$in$-$time production line to support demand from a neighboring appliance manufacturer. Demand from the appliance manufacturer is for $360$ compressors a day. The production lead time is $4$ days and the producer wants to have a $12\%$ safety stock factor. This producer has also cut setup costs such that the optimal production quantity is $41$ units.

How many kanbans does this producer of compressors require? $($Display your answer to the most appropriate whole number.$)$

Number