from time import process_time as clock

def is_prime(n):
	if n < 2 : return False
	for i in range(2, n):
		if n % i == 0 : return False
	return True

start = clock()

N = 60000; primes = []
for i in range(N):
	if is_prime(i):
		primes.append(i)

print("elapsed:", clock() - start, "s")