Create a semaphore to control the access to several files. $(7)$

$$ Create $15$ threads that are writing to $5$ files. Use your semaphore to control the access to these files. The

threads will run infinitely, where each loop will create two random numbers less than $20000.$ They will then

add, multiply and subtract these numbers. The thread will write the numbers and the computation results

to one of the files. Java