#include <iostream>
using namespace std;

int main() {
	int n;
	cin >> n;

	int count = 0;
	int num = 1;
	while (n - num * 2 >= 0) {
		num *= 2;
		count++;
	}

	if (n - num > 0) {
		count++;
	}

	cout << count << endl;

	return 0;
}