#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <list>
#include <typeinfo>
using namespace std;
#define REP(a,b) for(long long a = 0;a < b;++a)
int main() {
	long long ans = 1;
	int n;
	int cnt = 0;
	cin >> n;
	while (ans < n) {
		ans *= 2;
		cnt++;
	}
	cout << cnt << endl;
}