822 B | 822 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta
BLANK = " "
inp = input
# inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def f(num, k):
l = []
while num > 0:
l.append(num % k)
num //= k
return l[::-1]
def g(ar):
ret = 0
for i in range(len(ar) - 1):
if ar[i] != ar[i + 1]:
ret += 1
return ret
def solve():
k = ii()
ans = 0
mn = 1111111111111
for i in range(2, 11):
comp = g(f(k, i))
if mn >= comp:
mn = comp
ans = i
p(ans)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()