#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
int main() {
	long n;
	cin >> n;
	long l = 0, r = n + 1, co = 0;
	while (r - l > 1) {
		long mid = (l + r) / 2;
		if (mid - l >= r - mid) {
			r = mid;
		}
		else {
			l = mid;
		}
		co++;
	}
	cout << co << endl;
}