#include<string>
#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
	int n,cnt,num;
	cin>>n;
	cnt = 0;
	num = 1;
	while(1)
	{

		if( n <= num){
			cout<<cnt<<endl;
			break;
		}
		num=num<<1;
		cnt++;
		//cout<<num<<endl;
	}
	return 0;
}