CSAW CTF Qual 2016 [Misc][25pts]Coinslot

coinslot.py

from pwn import *

def check(current):
        global amount
        count = 0
        current = int(current*100)
        while True:
                if amount < current:
                        print count
                        break
                else:
                        amount -= current
                        count += 1
        return str(count)

r = remote('misc.chal.csaw.io', 8000)
while True:
        amount = float(r.recvline().replace('$','').replace('\n','').replace(',',''))
        print amount
        amount = int(round(amount*100))
        print amount
        r.sendline(check(10000))
        r.sendline(check(5000))
        r.sendline(check(1000))
        r.sendline(check(500))
        r.sendline(check(100))
        r.sendline(check(50))
        r.sendline(check(20))
        r.sendline(check(10))
        r.sendline(check(5))
        r.sendline(check(1))
        r.sendline(check(0.5))
        r.sendline(check(0.25))
        r.sendline(check(0.1))
        r.sendline(check(0.05))
        r.sendline(check(0.01))
        print r.recvline()