import random
import queue

def is_prime(n):
	if n==1: return False
	if n==2: return True
	if n%2==0: return False
	q = (n-1)>>1
	while q&1 == 0:
		q >>= 1
	# print("n={}, q={}".format(n, q))
	for i in range(30):
		a = random.randint(1, n-1)
		a_pow = pow(a, q, n)
		if a_pow == 1:
			continue
		j = 0
		while a_pow != n-1 and (1<<(j+1))*q != n-1:
			a_pow *= a_pow
			a_pow %= n
			j+=1
		if (1<<(j+1))*q==n-1 and a_pow != n-1:
			return False
	return True

magic = [0, 1, 0, 0, 3, 0, 5, 0, 7, 7, 7, 0, 11, 0, 13, 7, 7, 0, 8, 0, 19, 19, 7, 0, 23, 23, 8, 8, 8, 0]
N = int(input())
if N < 30:
	print(magic[N])
else:
	if N%8 == 1 and is_prime(N-8):
		print(14)
	else:
		print(8)