from math import isqrt

N = int(input())

ans = N - 1
for i in range(2, isqrt(N)):
    if N % i:
        continue
    div = N // i
    for x in range(1, 50):
        # bisect
        l, r = 1, div
        while r - l > 1:
            m = (r + l) // 2
            if (m ** x - 1) < div * (m - 1):
                l = m
            else:
                r = m
        if (r ** x - 1) == div * (r - 1):
            ans = min(ans, r)
print(ans)