Tags: misc
Rating:
## Solution
Bobs favorite number is the sum of 1856*y+2014*z where y and z are unknown. So we can just iteratively subtract 1856 from the number while number > 1856 and check to see if num %2014 is equal to 0. If so, then its one of bobs favorite numbers and we can return True.
```python
from pwn import *
p = remote('35.193.60.121',1337)
def isFavorite(num):
while num > 1856:
num -= 1856
if (num % 2014 == 0):
return b"Yes"
return b"No"
while True:
num=int(p.recvline())
print(num)
p.sendline(isFavorite(num))
print(p.recvline())
print(p.recvline())
p.interactive()
```
Running our script yields the flag
```
$ python3 bobs_favorite.py
746
b'Answer: \n'
b'Good one\n'
Traceback (most recent call last):
File "/root/workspace/access_denied/bob/bobs_favorite.py", line 15, in <module>
num=int(p.recvline())
ValueError: invalid literal for int() with base 10: b'accessdenied{b0bs_f4v0r1t3_numb3r5_4r3_m1n3_f4v0urit3_t00_61c884c8}\n'
```
