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):
        if 2 ** j - 1 > s:
            break
        if j < 10:
            lower = i
            upper = min(s, ans)
            while lower + 1 < upper:
                p = (lower + upper) // 2
                sm = (p ** j - 1) // (p - 1)
                if sm == s:
                    ans = min(ans, p)
                    break
                if sm < s:
                    lower = p
                else:
                    upper = p
        else:
            for p in range(i + 1, 40):
                sm = (p ** j - 1) // (p - 1)
                if sm == s:
                    ans = min(ans, p)
                if sm >= s:
                    break

print(ans)