#include <bits/stdc++.h>
using namespace std;

int main()
{
	int n;
	cin >> n;
	vector<int> v;
	int cnt = 1;
	while(cnt <= 200000000)
	{
		v.push_back(cnt);
		cnt *= 2;
	}
	
	for(int i = 0; i < (int)v.size(); i++)
	{
		if(n <= v[i])
		{
			cout << i << endl;
			return 0;
		}
	}
	return 0;
}