n = int(input())
ans = n + 1
for i in range(1, 10 ** 6 + 1):
    if n % i != 0:
        continue
    s = n // i
    for j in range(2, 41):
        lower = 1
        upper = 10 ** 12
        while lower + 1 < upper:
            p = (lower + upper) // 2
            sm = (p ** j - 1) // (p - 1)
            if sm == s:
                if i < p:
                    ans = min(ans, p)
                break
            if sm < s:
                lower = p
            else:
                upper = p

print(ans)