#include <iostream>
#include <algorithm>

using namespace std;

int main() {
	int n;
	cin >> n;
	int biscuit = 1;
	int count = 0;
	while (biscuit < n) {
		int multiplied = min(biscuit, n - biscuit);
		biscuit += multiplied;
		++count;
	}
	cout << count << endl;
	return 0;
}