There is a new computer malware called Mirai. designed for spreading and infecting IoT (Internet of things) devices like an IP camera, smart thermostat etc. Once a Mirai infects a IoT device, it sends a copy of itself to 100 other IoT devices in the network. What is the maximum number of different IoT devices one infected IoT device can infect in the time it takes for the infected malware to be forwarded four times?