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**5):
        ls = list(Dec_to_N(N,i))
        
        f = True
        n = ls[0]
        for j in range(len(ls)):
            if ls[j] != n:
                f = False
                break
        
        if f:
            print(i)
            exit()
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
if __name__ == '__main__':
    main()