I want to make a simulation of a machine : The machine should start working when it has an input of 5 cans ( the source with interarrival time =4 min) , the machine give an output product each 15 min, when it reaches 4 output product , it releases the 5 input cans (empty) ; so we can say that we have 5 cans consumed in 60 min then they need to replace it , and output cans every 15 min