#include <iostream>
#include <fstream>
#include <string> 
#include <cmath>  
#include <cstdlib>
#include <ctime>
#include <vector>
#include <algorithm>
#include <numeric>
using namespace std;
int main() {
	int N,a,i; 
	cin >> N;
	a = 1;
	i = 0;
	while (a < N) {
		a *= 2;
		i++;
	}
	cout << i << endl;
	cin >> a;
	return 0;
}