n = int(input())
pli = [2, 3]
for i in range(1, n, 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 = [1]
tn = n * (n + 1) // 2
for i in pli:
	while tn % i == 0:
		tn //= i
		t.append(i)

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