#include<bits/stdc++.h>
using namespace std;
long long a,answer;
int main()
{	
	cin>>a;
	for(int i=0;;i++)
	{
		a=a/2;
		answer++;
		if(a==1)
		{
			answer=answer+1;
			break;
		}
	}
	cout<<answer;
	return 0;
}