import sys
import os
import signal
from time import time, sleep
from os.path import *
from threading import Thread, Lock

def timer(num, interval):
    while True:
        print('now:', i,  s)
        sys.stdout.flush()
        sleep(interval)

def shutdown():
    sys.exit(0)

signal.signal(signal.SIGINT, shutdown)

i = 0
s = 0

t = Thread(target=timer, args=(1,3))
t.daemon=True
t.start()

for i in range(200_000_000):
    s += i

print(s)