def main():
    from math import sqrt,sin,cos,tan,ceil,radians,floor,gcd,exp,log,log10,log2,factorial,fsum
    from heapq import heapify, heappop, heappush
    from bisect import bisect_left, bisect_right
    from copy import deepcopy
    import copy
    import random
    from collections import deque,Counter,defaultdict
    from itertools import permutations,combinations
    from decimal import Decimal,ROUND_HALF_UP
    #tmp = Decimal(mid).quantize(Decimal('0'), rounding=ROUND_HALF_UP)
    from functools import lru_cache, reduce
    #@lru_cache(maxsize=None)
    from operator import add,sub,mul,xor,and_,or_,itemgetter
    INF = 10**18
    mod1 = 10**9+7
    mod2 = 998244353
    
    #DecimalならPython
    
    
    '''
    
    
    
    '''
    
    def Dec_to_N(num, base):
        if num >= base:
            yield from Dec_to_N(num // base, base)
        yield num % base

    def N_to_Dec(digits, base):
        num = 0
        for digit in digits:
            num = num * base + digit
        return num

    
    N = int(input())
    
    for i in range(2,10**6+1):
        tmp = 0
        while tmp*i+1 <= N:
            tmp *= i
            tmp += 1
        
        if N%tmp == 0 and 1<=N//tmp<i:
            print(i)
            exit()
    
    ans = INF
    for i in range(1,int(sqrt(N))+1):
        if N%i == 0:
            j = N//i
            
            p = j-1
            
            if 1<=i<p:
                ans = min(ans, p)
    
    print(ans)
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
if __name__ == '__main__':
    main()