"""
P5720 【深基4.例4】一尺之棰
https://www.luogu.com.cn/problem/P5720
"""
ans=1
a=int(input())
while a>1:
ans+=1
a//=2
print(ans)
"""
P5720 【深基4.例4】一尺之棰
https://www.luogu.com.cn/problem/P5720
"""
ans=1
a=int(input())
while a>1:
ans+=1
a//=2
print(ans)