import sys
def input(): return sys.stdin.readline().strip()
def mapint(): return list(map(int, input().split()))
sys.setrecursionlimit(10**9)

N = int(input())

def make_divisors(n):
    lower_divisors , upper_divisors = [], []
    i = 1
    while i*i <= n:
        if n % i == 0:
            lower_divisors.append(i)
            if i != n // i:
                upper_divisors.append(n//i)
        i += 1
    return lower_divisors + upper_divisors[::-1]

candidates = make_divisors(N)
candidates.sort()
lis = set()

for first in candidates:
    koho = make_divisors(N-first)
    for k in koho:
        lis.add(k)
lis = list(lis)
lis.sort()

for c in lis[1:]:
    base = N
    lis = []
    while base>0:
        if lis and base%c!=lis[-1]:
            break
        lis.append(base%c)
        base //= c
    if base==0:
        print(c)
        exit()