#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <numeric>

using namespace std;
typedef long long int lint;

int main()
{
	int N, b = 1, clap = 0;
	cin >> N;

	while (b < N) {
		clap++;
		b *= 2;
	}

	cout << clap << endl;

	return 0;
}