Introduction to pwntools

When connecting to the netcat instance, we see this

└─# nc challs.sieberr.live 1000
Welcome to the introduction to pwntools exercise!
In this exercise, your goal is to earn a total of 50 points.

We will be providing you with 2 numbers, and you should use pwntools and python to multiply the 2 numbers together.
A correct answer will garner you 1 point.
n1: 411
n2: 546
What is the value when n1 is multiplied by n2?

Writing solve script

from pwn import *

p = remote("challs.sieberr.live", 1000) # connects to netcat instance
for i in range(50):  
    p.recvuntil("n1:")  
    n1 = p.recvline() # get value of n1
    # parse out the number but im bad at coding lol inefficiency go brrr
    n1edited = int(str(n1).split(" ")[1].split("\\")[0])  
    print(n1edited)
    p.recvuntil("n2") # get value of n2
    # parse
    n2 = int(str(p.recvline()).split(":")[1].split("\\")[0])
    print(n2)
    payload = str(n1edited * n2)  # calculate product
    print(payload) 
    p.sendline(payload) # send answer

p.interactive()

Running solve script

└─# python3 solve.py
[+] Opening connection to challs.sieberr.live on port 1000: Done
/mnt/f/sieberrctf/PWN/pwntoolsintro/solve.py:5: BytesWarning: Text is not bytes; assuming ASCII, no guarantees. See https://docs.pwntools.com/#bytes
  p.recvuntil("n1:")
/mnt/f/sieberrctf/PWN/pwntoolsintro/solve.py:10: BytesWarning: Text is not bytes; assuming ASCII, no guarantees. See https://docs.pwntools.com/#bytes
  p.recvuntil("n2")
/mnt/f/sieberrctf/PWN/pwntoolsintro/solve.py:15: BytesWarning: Text is not bytes; assuming ASCII, no guarantees. See https://docs.pwntools.com/#bytes
  p.sendline(payload)
[*] Switching to interactive mode
What is the value when n1 is multiplied by n2? That is correct
Your score: 50

sctf{n0w_y0u_sh4ll_pwn}
[*] Got EOF while reading in interactive
$

flag: sctf{n0w_y0u_sh4ll_pwn}