#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <map>
#include <list>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <iomanip>

using namespace std;



int main(void)
{
	int N;
	int res = 0;

	cin >> N;

	while (1) {
		if((int)pow(2, res) >= N) break;
		res++;
	}
	
	cout << res << endl;

	return (0);
}