#include <iostream>
#include <algorithm>
#include <string>
using namespace std;

int main() {
	long long x, temp, cnt=0;
	cin >> x;
	temp = 1;
	if(x == 1){
		cnt++;
	}
	while(x > temp){
		temp *= 2;
		cnt++;
	}
	cout << cnt << endl;
	return 0;
}