n = int(input())
pli = [2, 3]
for i in range(6, n//2 + 1, 6):
	for p in pli:
		if i - 1 % p == 0:
			break
	else:
		pli.append(i - 1)

	for p in pli:
		if i + 1 % p == 0:
			break
	else:
		pli.append(i + 1)

t = []
tn = n * (n + 1) // 2
for i in pli:
	while tn % i == 0:
		tn //= i
		t.append(i)
	if tn == 1:
		break

li = [1]
for i in t:
	for j in range(len(li)):
		if li[j] * i <= n:
			li.append(li[j] * i)

li = list(set(li))
li.sort()
print(li[len(li)-1])