def base_k(num, k):
    result = set()
    while num > 0:
        amari = num%k
        result.add(amari)
        num -= amari
        num //= k
    return len(result)

def 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]

N = int(input())
if N <= 2:
    print(N+1)
    exit()

for i in range(2, N):
    if base_k(N, i) == 1:
        #print(i, calc) 
        print(i)
        exit()

divs = divisors(N)
for d in divs:
    if d <= N:
        continue
    calc = base_k(N, d-1)
    if calc == 1:
        #print(d-1, calc)   
        print(d-1)
        exit()