#include<bits/stdc++.h>
#include<iostream>
#include<iomanip>
#include<algorithm>
#include<cmath>
#include<string>
#include<map>
#include<queue>
#include<stack>
#include<iomanip>
#include<cstdio>
#include<stdio.h>
#define LL long long
using namespace std;
int main(){
   	LL a;
	LL sum=0;
	scanf("%d",&a);
	while(a!=1){
		a=a/2;
		sum++;
	}
	sum++;
	printf("%d",sum);
	return 0;
}

求助