# -*- coding: utf-8 -*-

N = int(input())
number = 0

i = 0
while 2**(i+1) < N:
    i += 1

if (N-2**i) == 1:
    i += 1
elif (N - 2**i)%2 == 1:
    i += 2
else:
    i += 1

print(i)