#!/usr/bin/env python

indat = int(input().strip())

ntimes = 0
ncookie = 1
while True:
    ncookie *= 2
    ntimes += 1
    if indat - ncookie*2 < 0:
        remain = indat - ncookie
        break

if remain - indat > 0:
    exit()
elif remain > 0:
    ntimes += 1

print(ntimes)