Five hundred or less

"Now then," Mathew muttered as he turned around. He cast a quick look at the state of the corridor before nodding his head with satisfaction.

"It seems they worked hard to clear it," he talked to himself as he moved up the path to inspect the bloody results of the policemen's rampage.

"That leaves us with only one side of the compound," the young man added as he raised his eyes to the glass that separated the corridor itself from the classes on its sides.

Thanks to this glass partition that started roughly at the height of one's belt and reached nearly all the way up to the ceiling, Mathew could look to the outside without stepping inside any of the classes.

"I guess we will need to clear it out before establishing the fortress," he continued to talk to himself. Yet, rather than staying on the topic, Mathew shook his head and threw one more look at the defeated zombies filling the corridor.