n = int(input())
ans = n + 1
for i in range(1, int(n ** 0.5 + 9)):
    if n % i != 0:
        continue
    s = n // i
    for j in range(2, 41):
        lower = 1
        upper = int(s ** (1 / (j - 1)) + 9)
        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)